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My BN1 #724, engine number 139756, has no float bowl drain tubes, just the
red notched washer and chrome vent at the top screw . I have never had the
problems that you report. The floats are original. I cleaned and rebuilt
with a Moss kit. If one of my carbs worked right and one did not, after
replacing all rebuild able parts, I would replace the malfunctioning carb.
If that fixes things you can explore the faulty carb at leisure. If it
doesn't, then the rear carb wasn't the problem.
-Roland
On Mon, Dec 23, 2024, 1:19=E2=80=AFPM Hank Leach via Healeys <healeys@autox=
.team.net>
wrote:
> Michael-that is why I asked the question in the beginning, Where is the
> fuel coming from and what is the cure for the problem? I agree that the
> fuel is "atomized" in the throttle area and that would be the best
> condition to send it to the engine but this car is dumping fuel and I
> cannot find the mechanism to stop that flow. Suggested lighter nitrile
> floats are at the top of the list, if in fact my brass ones are bum. Bill
> Lawrence modified his intakes possibly due to fuel issues? The system on
> this early car (same as yours) is a bit "cruder" than the revised float
> bowl vent system (with no manifold drain?). And, I cannot see anything
> wrong the float setting as presently set.
> The fuel is not coming out the jet with the key off and the float bowls
> full to proper level-it is as you said below the top of the jet. Float
> valves are closed. Its when the key is on and fuel pressure is applied
> that I am getting the overflow condition. I was hoping that someone else =
on
> the team has had a similar experience. Hank
> --------------------
>
> From: "Michael Salter" <michaelsalter@gmail.com>
> To: "Hank Leach" <gradea1@charter.net>
> Cc: "Healey team" <healeys@autox.team.net>
> Sent: December 23, 2024 at 12:21 PM PST
> Subject: Re: [Healeys] overflowing fuel into intake drain tube
> Sorry Hank but I think you have that wrong.
> In and SU carb,and for that matter almost every other type of carburettor=
,
> fuel DOES NOT pump out through the jet.
> The fuel level, as mentioned previously, is controlled by the float
> chamber float valve to never actually be above the top of the jet. It is
> only the flow of air across the carburettor "bridge", where the jet is
> positioned, that draws fuel up through the jet to be atomized into the
> airflow and into the inlet manifold.
> This is all related to Bernoulli's principle
> <https://www.google.com/search?client=3Dfirefox-b-d&q=3DBernoulli%27s+pri=
nciple>
> which is the basis upon which all carburettors work.
> If fuel is coming out of the jet when the engine is not running then the
> mechanism controlling the float level is not operating correctly.
>
> M
>
> On Mon, Dec 23, 2024 at 1:37=E2=80=AFPM Hank Leach via Healeys <
> healeys@autox.team.net> wrote:
>
>> Ah! A rebel in the crowd. I looked at a bunch of photos of 1953 100
>> engines on the web. Many are configured as mine with NO FLOAT BOWL DRAI=
N
>> TUBES. The *later *engine setups have drain tubes in the lid. This
>> includes the cars using H6 carbs (Lemans). Also, on these early designs
>> there is a different carb adaptor. Part 1B1672 which has a lower drain =
in
>> the casing up to engine # 139915 (my engine 139563). Of course Moss,
>> etc. only sell the later style products. but some books show the solid
>> float lids and some show vented lids and some show a lid with a drain tu=
be
>> (air vent).
>>
>> So, in theory the way the early system works; fuel is inlet from the
>> float chamber and enters the jet thru a hole in the tube positioned betw=
een
>> the two gland washers which are to keep the fuel intact. when the choke =
is
>> pulled that jet hole is lowered to send in, as the British say..."a nea=
t
>> petrol supply" to start the car.
>> Now, if you turn on the key, fuel pumps in and is moved thru the jet int=
o
>> the throttle area and into the manifold. Unless the engine is now turnin=
g
>> and suction from the piston is active, the fuel will run haplessly in th=
e
>> intake manifold and out the drain tube to the ground. So the important
>> procedure in these early systems is turn the key and crank the engine
>> immediately or it will overflow fuel down the drain tube. I'm here
>> testing the operation of the carburetors in a static mode-its not going =
to
>> do anything but spew fuel to the ground. Right?
>>
>> The later design using a float bowl vent tube also send fuel into the
>> manifold but without a drain tube the fuel will go into the engine, as t=
he
>> Moss PDF described, diluting the oil and washing the cylinders. Sounds l=
ike
>> the best method of starting up is to crank the engine as soon as you hea=
r
>> the fuel pump click...I typically have waited until the pump stopped (fl=
oat
>> bowls full) before cranking. Live and learn?Hank
>>
>>
>> --------------------
>>
>> From: "WILLIAM B LAWRENCE" <ynotink@msn.com>
>> To: "Hank Leach via Healeys" <healeys@autox.team.net>, "Bob Haskell" <
>> rchaskell@earthlink.net>, "richard mayor" <boyracer466@gmail.com>, <
>> gradea1@charter.net>
>> Sent: December 22, 2024 at 9:29 PM PST
>> Subject: Re: [Healeys] overflowing fuel into intake drain tube
>>
>> I=E2=80=99d like to be able to answer that, but I have to confess I=E2=
=80=99ve modified
>> the induction system on mine (I know, I=E2=80=99m going to Hell) and I=
=E2=80=99m a little
>> fuzzy on the details. If memory serves (a doubtful premise) the float bo=
wls
>> originally had an open vent arrangement on the top with no drain tubes. =
The
>> car was built up from several dozen boxes of parts, so that may not have
>> been correct. About 20 years ago I built a pair of H6s and installed tho=
se
>> with drain tubes. The car is a bitsa anyway so originality is secondary,=
or
>> maybe tertiary=E2=80=A6
>>
>> Bill Lawrence
>> BN1 554
>> ------------------------------
>> *From:* Healeys <healeys-bounces@autox.team.net> on behalf of Hank Leach
>> via Healeys <healeys@autox.team.net>
>> *Sent:* Monday, December 23, 2024 1:59 AM
>> *To:* Bob Haskell <rchaskell@earthlink.net>; richard mayor <
>> boyracer466@gmail.com>
>> *Cc:* healeys <healeys@autox.team.net>
>> *Subject:* Re: [Healeys] overflowing fuel into intake drain tube
>>
>> Thanks Bob-yes the Moss site confirms they have alternate nitrile floats
>> and about $20 each. Looking at the diagram there is a drawing of the flo=
at
>> chamber overflow AUC1866 (451-250) $24.99 each. I do not have these
>> overflows on my float bowls (as Richard Mayor mentioned their location)
>> Instead the early cars have silver vent caps and a red washer which allo=
ws
>> air out and those two intake manifold copper drain pipes at the bottom o=
f
>> the carb intakes. There is a PDF note on that part which reads:
>>
>> "These pipes are open to the atmosphere, for two reasons: first (and mos=
t
>> important) they allow the fuel coming into the float bowl to displace th=
e
>> air in there so the fuel can reach its correct level in a timely manner.
>> Second, if the float valve (needle-and-seat) should stick open (as they =
do
>> when a bit of grit is trapped on the mating surfaces) the fuel will be
>> piped out and down =E2=80=93 away from the engine. If the *fuel could no=
t escape
>> through the overflow pipe, it would pour down the carburetor throat into
>> the engine*. With that much liquid gasoline, not all of it will vaporize
>> before the spark plug fires. The fuel that does vaporize will make the
>> mixture so rich (as if the choke were engaged) the car will belch black
>> smoke out the tailpipe. The engine will eventually flood and die."
>>
>> The point here is that not having those overflows on the float bowls; th=
e
>> overflow is actually after the throttle plates on my car. I wonder how B=
ill
>> Lawrence's early car is configured and if he has float bowl overflows or
>> intake overflows? Is it possible that this is a clue to my delima? Trapp=
ed
>> air? Hank
>> --------------------
>>
>> From: "Bob Haskell" <rchaskell@earthlink.net>
>> To: <gradea1@charter.net>, "richard mayor" <boyracer466@gmail.com>
>> Cc: "healeys" <healeys@autox.team.net>
>> Sent: December 22, 2024 at 4:28 PM PST
>> Subject: Re: [Healeys] overflowing fuel into intake drain tube
>>
>> Hank,
>>
>> I think the newest floats are made from nitrile rubber - nitrophyl, not
>> plastic. Supposedly unsinkable.
>>
>> Cheers,
>>
>> Bob Haskell
>> Austin-Healey 3000 roadster registrar
>>
>> On 12/22/24 17:49, Hank Leach via Healeys wrote:
>>
>> I actually cannot figure where all the fuel is coming from. In static
>> mode-key off and float bowls at proper level-with dashpot and piston
>> removed, no fuel is apparent (as Michael says about 1/8" below jet or as
>> you say equal to float setting). However, with key on and carbs together
>> it's a different story-fuel is flowing steadily. The suggestion that was
>> made that we really need to have clear plastic float bowls has merit. I
>> cannot tell if the brass float is pushing hard enough to shut off the pe=
g
>> on the valve. When held shut by hand its positive.
>>
>> If the float is "heavy", then it will not effect enough pressure on the
>> peg to stop the flow. This is why someone suggested plastic floats inste=
ad
>> of brass. Fuel is the shut off mechanism. I have swapped float and needl=
e
>> valves from front to rear carb in hopes that the front one will now star=
t
>> leaking. That may be a clue to the issue. Waiting for a dry day (next
>> year?) to test that theory.
>> --------------------
>>
>> From: "richard mayor" <boyracer466@gmail.com> <boyracer466@gmail.com>
>> To: "Leach Hank" <gradea1@charter.net> <gradea1@charter.net>
>> Cc: "healeys" <healeys@autox.team.net> <healeys@autox.team.net>
>> Sent: December 22, 2024 at 2:23 PM PST
>> Subject: Re: [Healeys] overflowing fuel into intake drain tube
>> Hank,
>>
>> If I read your post correctly, the fuel is coming out of the jet in the
>> carburetor into the intake manifold and then out the drain tube. Not fr=
om
>> the overflow tube on the float chamber. I=E2=80=99ll proceed with this a=
ssumption.
>>
>> The level of fuel at the jet is the same level as that in the float
>> chamber. That is the way these SU carbs are designed. That is why float
>> level is so important. If fuel is flowing out of the jet before the
>> needle valve shuts off the fuel supply at the float chamber then your fl=
oat
>> level is set too high. You need to close the float needle valve with th=
e
>> float at a lower level. Instead of using 7/16th as a guide, try 1/2=E2=
=80=9D and
>> see if that stops the flow. But then you said you tried different
>> settings.
>>
>> Is there an obstruction that is preventing the float from rising all the
>> way to the top to close the needle valve? Try a different float. Polish
>> the post. Is there any wear in the fork or pivot in the casting that is
>> not allowing the needle to move feely into it=E2=80=99s seat. I think t=
hat=E2=80=99s where
>> the problem is.
>>
>> Richard Mayor
>> boyracer466@gmail.com
>>
>>
>> On Dec 22, 2024, at 12:28=E2=80=AFPM, Hank Leach via Healeys
>> <healeys@autox.team.net> <healeys@autox.team.net> wrote:
>> I have chased the cause of too much fuel exiting from the rear
>> carburetor overflow of my 100 for years. These are H4 carbs-very simple
>> design, but must be done correctly to perform. So I find that the jet is
>> out of center and piston is sticking up above the flat about 1/8"-that
>> would allow fuel to run into throttle area and out overflow drain tube.
>>
>> No way to center jet on car. Remove carburetor-a 4 hour job- and clean
>> and replace gaskets and gland washers-yes cork- and reassemble and cente=
r
>> jet...now works perfect. Re mount carburetor and connect fuel lines-anot=
her
>> 4 hour job. Both carb pistons drop with a clunk at the same time. Turn=
on
>> key- fuel pump clicking-overflow again leaking.
>>
>> I have reset the floats and float needles (brass) were replaced many
>> times-that's not the issue. No fuel in float bodies-they are not leaking=
.
>> I just cant believe its too much fuel pressure but then again, this is a
>> British Car.
>> Float is brass but when shaked it is dry. I filled the float lid with
>> carb cleaner while holding needle valve closed and no leaking. That's tw=
o
>> places checked (these are unfortunately "new" parts) Now the next leak
>> could be between the needle and jet if not closed off-also new parts-jet
>> .090. Needles are QW as specified but i also have a set of ATs which are
>> lean that I am tempted to try. Actually both needles are about the same =
at
>> top .089, but ATs are a bit fatter at mid range. Problem is all testing
>> stinks up the garage and creates an explosive atmosphere so best done
>> outside in the rain.
>>
>> I know some folks like Grosse Jets-but I don't-- I prefer the simple
>> brass ones with viton tips which do work if pressure is applied by forke=
d
>> leg-also new, and set to 7/16" or MORE. With covers off, both bowls are
>> equally about 1/2 filled. Fuel pressure is a thought as it can push by t=
he
>> stops but its the correct pump and when key on clicks fast then slows to=
a
>> stop... but then tick, tick which it should not do! Fuel is going out a=
nd
>> down the drain tube to my swimming pool drip pan. Im tempted to measure =
the
>> top of the needles to see if they are really at .089. Can't measure the =
new
>> jet but its stamped "9" Maybe stick in a number drill to see if its roun=
d?
>> Mind you, these carbs have about 125 miles total on them. As far as I kn=
ow
>> these are "genuine SU" parts-not Moss India knockoffs.
>>
>> I really thought that the centering was the issue and took the carb off
>> for that reason which cured the drop-each drops equally with thud. That'=
s
>> not the problem. Any suggestions? Someone says use plastic floats...Hank
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--000000000000c6a0ec0629f99b5f
Content-Transfer-Encoding: quoted-printable
<p dir=3D"ltr">My BN1 #724, engine number 139756, has no float bowl drain t=
ubes, just the red notched washer and chrome vent at the top screw .=C2=A0 =
I have never had the problems that you report.=C2=A0 The floats are origina=
l.=C2=A0 I cleaned and rebuilt with a Moss kit.=C2=A0 If one of my carbs wo=
rked right and one did not, after replacing all rebuild able parts, I would=
replace the malfunctioning carb.=C2=A0 If that fixes things you can explor=
e the faulty carb at leisure.=C2=A0 If it doesn't, then the rear carb w=
asn't the problem.<br>
-Roland </p>
<br><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Dec 23, 2024, 1:19=E2=80=AFPM Hank Leach via Healey=
s <<a href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div>Michael-that is why=
I asked the question in the beginning, Where is the fuel coming from and w=
hat is the cure for the problem? I agree that the fuel is "atomized&qu=
ot; in the throttle area and that would be the best condition to send it to=
the engine but this car is dumping fuel and I cannot find the mechanism to=
stop that flow. Suggested lighter nitrile floats are at the top of the lis=
t, if in fact my brass ones are bum. Bill Lawrence modified his intakes pos=
sibly due to fuel issues?=C2=A0 The system on this early car (same as yours=
) is a bit "cruder" than the revised float bowl vent system (with=
no manifold drain?). And, I cannot see anything wrong the float setting as=
presently set.</div>
<div>The fuel is not coming out the jet with the key off and the float bowl=
s full to proper level-it is as you said below the top of the jet. Float va=
lves are closed.=C2=A0 Its when the key is on and fuel pressure is applied =
that I am getting the overflow condition. I was hoping that someone else on=
the team has had a similar experience. Hank<br>-------------------- <br><b=
r>From: "Michael Salter" <<a href=3D"mailto:michaelsalter@gmai=
l.com" target=3D"_blank" rel=3D"noreferrer">michaelsalter@gmail.com</a>>=
<br>To: "Hank Leach" <<a href=3D"mailto:gradea1@charter.net"; =
target=3D"_blank" rel=3D"noreferrer">gradea1@charter.net</a>> <br>Cc: &q=
uot;Healey team" <<a href=3D"mailto:healeys@autox.team.net"; target=
=3D"_blank" rel=3D"noreferrer">healeys@autox.team.net</a>> <br>Sent: Dec=
ember 23, 2024 at 12:21 PM PST <br>Subject: Re: [Healeys] overflowing fuel =
into intake drain tube </div>
<div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">Sorry Hank but I think you have that wrong.</div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">In and SU carb,and for that matter almost every other type of carb=
urettor, fuel DOES NOT pump out through the jet. </div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">The fuel level, as mentioned previously, is controlled by the floa=
t chamber float valve to never actually be above the top of the jet. It is =
only the flow of air across the carburettor "bridge", where the j=
et is positioned, that draws fuel up through the jet to be atomized into th=
e airflow and into the inlet manifold. </div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">This is all related to <a href=3D"https://www.google.com/search?cl=
ient=3Dfirefox-b-d&q=3DBernoulli%27s+principle" target=3D"_blank" rel=
=3D"noreferrer">Bernoulli's principle</a> which is the basis upon which=
all carburettors work.</div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">If fuel is coming out of the jet when the engine is not running th=
en the mechanism controlling the float level is not operating correctly.</d=
iv>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">=C2=A0</div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">M</div>
</div>
<div>=C2=A0</div>
<div class=3D"gmail_quote">
<div class=3D"gmail_attr">On Mon, Dec 23, 2024 at 1:37=E2=80=AFPM Hank Leac=
h via Healeys <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blan=
k" rel=3D"noreferrer">healeys@autox.team.net</a>> wrote:</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<div>Ah! A rebel in the crowd. I looked at a bunch of photos of 1953 100 en=
gines on the web.=C2=A0 Many are configured as mine with NO FLOAT BOWL DRAI=
N TUBES.=C2=A0 The <em>later </em>engine setups have drain tubes in the lid=
. This includes the cars using H6 carbs (Lemans).=C2=A0 Also, on these earl=
y designs there is a different carb adaptor. Part 1B1672=C2=A0 which has a =
lower drain in the casing<span style=3D"text-decoration:underline"> up to e=
ngine # 139915</span> (my engine 139563). Of course Moss, etc. only sell th=
e later style products. but some books show the solid float lids and some s=
how vented lids and some show a lid with a drain tube (air vent).</div>
<div>=C2=A0</div>
<div>So, in theory the way the early system works; fuel is inlet from the f=
loat chamber and enters the jet thru a hole in the tube positioned between =
the two gland washers which are to keep the fuel intact. when the choke is =
pulled that jet hole=C2=A0 is lowered to send in, as the British say...&quo=
t;a neat petrol supply" to start the car.</div>
<div>Now, if you turn on the key, fuel pumps in and is moved thru the jet i=
nto the throttle area and into the manifold. <span style=3D"text-decoration=
:underline">Unless the engine is now turning</span> and suction from the pi=
ston is active, the fuel will run haplessly in the intake manifold and out =
the drain tube to the ground. So the important procedure in these early sys=
tems is turn the key and crank the engine <span style=3D"text-decoration:un=
derline">immediately</span> or it will overflow fuel down the drain tube.=
=C2=A0 I'm here testing the operation of the carburetors in a static mo=
de-its not going to do anything but spew fuel to the ground. Right?</div>
<div>=C2=A0</div>
<div>The later design using a float bowl vent tube also send fuel into the =
manifold but without a drain tube the fuel will go into the engine, as the =
Moss PDF described, diluting the oil and washing the cylinders. Sounds like=
the best method of starting up is to crank the engine as soon as you hear =
the fuel pump click...I typically have waited until the pump stopped (float=
bowls full) before cranking. Live and learn?Hank</div>
<div>=C2=A0</div>
<div><br>-------------------- <br><br>From: "WILLIAM B LAWRENCE" =
<<a href=3D"mailto:ynotink@msn.com"; rel=3D"noopener noreferrer" target=
=3D"_blank">ynotink@msn.com</a>> <br>To: "Hank Leach via Healeys&qu=
ot; <<a href=3D"mailto:healeys@autox.team.net"; rel=3D"noopener noreferre=
r" target=3D"_blank">healeys@autox.team.net</a>>, "Bob Haskell"=
; <<a href=3D"mailto:rchaskell@earthlink.net"; rel=3D"noopener noreferrer=
" target=3D"_blank">rchaskell@earthlink.net</a>>, "richard mayor&qu=
ot; <<a href=3D"mailto:boyracer466@gmail.com"; rel=3D"noopener noreferrer=
" target=3D"_blank">boyracer466@gmail.com</a>>, <<a href=3D"mailto:gr=
adea1@charter.net" rel=3D"noopener noreferrer" target=3D"_blank">gradea1@ch=
arter.net</a>> <br>Sent: December 22, 2024 at 9:29 PM PST <br>Subject: R=
e: [Healeys] overflowing fuel into intake drain tube</div>
<div style=3D"font-family:inherit;font-size:inherit;color:inherit;backgroun=
d-color:transparent">=C2=A0</div>
<div style=3D"font-family:inherit;font-size:inherit;color:inherit;backgroun=
d-color:transparent">I=E2=80=99d like to be able to answer that, but I have=
to confess I=E2=80=99ve modified the induction system on mine (I know, I=
=E2=80=99m going to Hell) and I=E2=80=99m a little fuzzy on the details. If=
memory serves (a doubtful premise) the float bowls originally had an open =
vent arrangement on the top with no drain tubes. The car was built up from =
several dozen boxes of parts, so that may not have been correct. About 20 y=
ears ago I built a pair of H6s and installed those with drain tubes. The ca=
r is a bitsa anyway so originality is secondary, or maybe tertiary=E2=80=A6=
</div>
<div style=3D"font-family:inherit;font-size:inherit;color:inherit;backgroun=
d-color:transparent">=C2=A0</div>
<div style=3D"font-family:inherit;font-size:inherit;color:inherit;backgroun=
d-color:transparent">Bill Lawrence</div>
<div style=3D"font-family:inherit;font-size:inherit;color:inherit;backgroun=
d-color:transparent">BN1 554</div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"m_3659040959950062496m_-6618822986480632876divRplyFwdMsg"><stron=
g>From:</strong> Healeys <<a href=3D"mailto:healeys-bounces@autox.team.n=
et" rel=3D"noopener noreferrer" target=3D"_blank">healeys-bounces@autox.tea=
m.net</a>> on behalf of Hank Leach via Healeys <<a href=3D"mailto:hea=
leys@autox.team.net" rel=3D"noopener noreferrer" target=3D"_blank">healeys@=
autox.team.net</a>><br><strong>Sent:</strong> Monday, December 23, 2024 =
1:59 AM<br><strong>To:</strong> Bob Haskell <<a href=3D"mailto:rchaskell=
@earthlink.net" rel=3D"noopener noreferrer" target=3D"_blank">rchaskell@ear=
thlink.net</a>>; richard mayor <<a href=3D"mailto:boyracer466@gmail.c=
om" rel=3D"noopener noreferrer" target=3D"_blank">boyracer466@gmail.com</a>=
><br><strong>Cc:</strong> healeys <<a href=3D"mailto:healeys@autox.te=
am.net" rel=3D"noopener noreferrer" target=3D"_blank">healeys@autox.team.ne=
t</a>><br><strong>Subject:</strong> Re: [Healeys] overflowing fuel into =
intake drain tube
<div>=C2=A0</div>
</div>
<div>
<div>Thanks Bob-yes the Moss site confirms they have alternate nitrile floa=
ts and about $20 each. Looking at the diagram there is a drawing of the flo=
at chamber overflow AUC1866 (451-250) $24.99 each.=C2=A0 I do not have thes=
e overflows on my float bowls (as Richard Mayor mentioned their location) I=
nstead the early cars have silver vent caps and a red washer which allows a=
ir out and those two intake manifold copper drain pipes at the bottom of th=
e carb intakes. There is a PDF note on that part which reads:</div>
<div>=C2=A0</div>
<div>"These pipes are open to the atmosphere, for two reasons: first (=
and most important) they allow the fuel coming into the float bowl to displ=
ace the air in there so the fuel can reach its correct level in a timely ma=
nner. Second, if the float valve (needle-and-seat) should stick open (as th=
ey do when a bit of grit is trapped on the mating surfaces) the fuel will b=
e piped out and down =E2=80=93 away from the engine. If the <strong>fuel co=
uld not escape through the overflow pipe, it would pour down the carburetor=
throat into the engine</strong>. With that much liquid gasoline, not all o=
f it will vaporize before the spark plug fires. The fuel that does vaporize=
will make the mixture so rich (as if the choke were engaged) the car will =
belch black smoke out the tailpipe. The engine will eventually flood and di=
e."</div>
<div>=C2=A0</div>
<div>The point here is that not having those overflows on the float bowls; =
the overflow is actually after the throttle plates on my car. I wonder how =
Bill Lawrence's early car is configured and if he has float bowl overfl=
ows or intake overflows? Is it possible that this is a clue to my delima? T=
rapped air? Hank</div>
<div>--------------------=C2=A0<br><br>From: "Bob Haskell" <<a=
href=3D"mailto:rchaskell@earthlink.net"; rel=3D"noopener noreferrer" target=
=3D"_blank">rchaskell@earthlink.net</a>> <br>To: <<a href=3D"mailto:g=
radea1@charter.net" rel=3D"noopener noreferrer" target=3D"_blank">gradea1@c=
harter.net</a>>, "richard mayor" <<a href=3D"mailto:boyrace=
r466@gmail.com" rel=3D"noopener noreferrer" target=3D"_blank">boyracer466@g=
mail.com</a>> <br>Cc: "healeys" <<a href=3D"mailto:healeys@=
autox.team.net" rel=3D"noopener noreferrer" target=3D"_blank">healeys@autox=
.team.net</a>> <br>Sent: December 22, 2024 at 4:28 PM PST <br>Subject: R=
e: [Healeys] overflowing fuel into intake drain tube</div>
<p>Hank,</p>
<p>I think the newest floats are made from nitrile rubber - nitrophyl, not =
plastic.=C2=A0 Supposedly unsinkable.</p>
<p>Cheers,</p>
<pre>Bob Haskell
Austin-Healey 3000 roadster registrar</pre>
<div>On 12/22/24 17:49, Hank Leach via Healeys wrote:</div>
<blockquote>
<div>I actually cannot figure where all the fuel is coming from. In static =
mode-key off and float bowls at proper level-with dashpot and piston remove=
d, no fuel is apparent (as Michael says about 1/8" below jet or as you=
say equal to float setting). However, with key on and carbs together it=
9;s a different story-fuel is flowing steadily. The suggestion that was mad=
e that we really need to have clear plastic float bowls has merit. I cannot=
tell if the brass float is pushing hard enough to shut off the peg on the =
valve. When held shut by hand its positive.</div>
<div>=C2=A0</div>
<div>If the float is "heavy", then it will not effect enough pres=
sure on the peg to stop the flow. This is why someone suggested plastic flo=
ats instead of brass. Fuel is the shut off mechanism. I have swapped float =
and needle valves from front to rear carb in hopes that the front one will =
now start leaking. That may be a clue to the issue. Waiting for a dry day (=
next year?) to test that theory.<br>-------------------- <br><br>From: &quo=
t;richard mayor" <a href=3D"mailto:boyracer466@gmail.com"; rel=3D"noope=
ner noreferrer" target=3D"_blank"> <boyracer466@gmail.com></a> <br>To=
: "Leach Hank" <a href=3D"mailto:gradea1@charter.net"; rel=3D"noop=
ener noreferrer" target=3D"_blank"> <gradea1@charter.net></a> <br>Cc:=
"healeys" <a href=3D"mailto:healeys@autox.team.net"; rel=3D"noope=
ner noreferrer" target=3D"_blank"> <healeys@autox.team.net></a> <br>S=
ent: December 22, 2024 at 2:23 PM PST <br>Subject: Re: [Healeys] overflowin=
g fuel into intake drain tube <br>Hank,</div>
<div>=C2=A0</div>
<div>If I read your post correctly, the fuel is coming out of the jet in th=
e carburetor into the intake manifold and then out the drain tube.=C2=A0 No=
t from the overflow tube on the float chamber. I=E2=80=99ll proceed with th=
is assumption.</div>
<div>=C2=A0</div>
<div>The level of fuel at the jet is the same level as that in the float ch=
amber. That is the way these SU carbs are designed. That is why float level=
is so important.=C2=A0 If fuel is flowing out of =C2=A0the jet before the =
needle valve shuts off the fuel supply at the float chamber then your float=
level is set too high.=C2=A0 You need to close the float needle valve with=
the float at a lower level. Instead of using 7/16th as a guide, try 1/2=E2=
=80=9D and see if that stops the flow.=C2=A0 But then you said you tried di=
fferent settings.=C2=A0</div>
<div>=C2=A0</div>
<div>Is there an obstruction that is preventing the float from rising all t=
he way to the top to close the needle valve?=C2=A0 Try a different float. P=
olish the post.=C2=A0 Is there any wear in the fork or pivot in the casting=
that is not allowing the needle to move feely into it=E2=80=99s seat.=C2=
=A0 I think that=E2=80=99s where the problem is.=C2=A0</div>
<div><br id=3D"m_3659040959950062496m_-6618822986480632876x_lineBreakAtBegi=
nningOfMessage">
<div>
<div>Richard Mayor</div>
<div><a href=3D"mailto:boyracer466@gmail.com"; rel=3D"noopener noreferrer" t=
arget=3D"_blank">boyracer466@gmail.com</a></div>
<div>=C2=A0</div>
</div>
<div><br>
<blockquote>
<div>On Dec 22, 2024, at 12:28=E2=80=AFPM, Hank Leach via Healeys <a href=
=3D"mailto:healeys@autox.team.net"; rel=3D"noopener noreferrer" target=3D"_b=
lank"> <healeys@autox.team.net></a> wrote:</div>
<div>
<div>
<div>=C2=A0I have chased the cause of too much fuel exiting from the rear c=
arburetor overflow of my 100 for years. These are H4 carbs-very simple desi=
gn, but must be done correctly to perform. So I find that the jet is out of=
center and piston is sticking up above the flat about 1/8"-that would=
allow fuel to run into throttle area and out overflow drain tube.=C2=A0
<div>=C2=A0</div>
<div>No way to center jet on car. Remove carburetor-a 4 hour job- and clean=
and replace gaskets and gland washers-yes cork- and reassemble and center =
jet...now works perfect. Re mount carburetor and connect fuel lines-another=
4 hour job.=C2=A0 Both carb pistons drop with a clunk at the same time.=C2=
=A0 Turn on key- fuel pump clicking-overflow again leaking.=C2=A0</div>
<div>=C2=A0</div>
<div>I have reset the floats and float needles (brass) were replaced many t=
imes-that's not the issue. No fuel in float bodies-they are not leaking=
.=C2=A0 I just cant believe its too much fuel pressure but then again, this=
is a British Car.=C2=A0</div>
</div>
<div>Float is brass but when shaked it is dry. I filled the float lid with =
carb cleaner while holding needle valve closed and no leaking. That's t=
wo places checked (these are unfortunately "new" parts) Now the n=
ext leak could be between the needle and jet if not closed off-also new par=
ts-jet .090. Needles are QW as specified but i also have a set of ATs which=
are lean that I am tempted to try. Actually both needles are about the sam=
e at top .089, but ATs are a bit fatter at mid range. Problem is all testin=
g stinks up the garage and creates an explosive atmosphere so best done out=
side in the rain.</div>
<div>=C2=A0</div>
<div>I know some folks like Grosse Jets-but I don't-- I prefer the simp=
le brass ones with viton tips which do work if pressure is applied by forke=
d leg-also new, and set to 7/16" or MORE. With covers off, both bowls =
are equally about 1/2 filled. Fuel pressure is a thought as it can push by =
the stops but its the correct pump and when key on clicks fast then slows t=
o a stop... but then tick, tick which it should not do!=C2=A0 Fuel is going=
out and down the drain tube to my swimming pool drip pan. Im tempted to me=
asure the top of the needles to see if they are really at .089. Can't m=
easure the new jet but its stamped "9" Maybe stick in a number dr=
ill to see if its round? Mind you, these carbs have about 125 miles total o=
n them. As far as I know these are "genuine SU" parts-not Moss In=
dia knockoffs.</div>
<div>=C2=A0</div>
<div>I really thought that the centering was the issue and took the carb of=
f for that reason which cured the drop-each drops equally with thud. That&#=
39;s not the problem. Any suggestions? Someone says use plastic floats...Ha=
nk</div>
</div>
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