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<div>Michael-yes, by measure the jet bore is to be .090 and the top taper =
of the QW needle is .089 leaving some room for a molecule of fluid. So, =
agree, it never shuts off. However, the drain pipe looks like a faucet =
spewing fuel to the floor. It has to come from somewhere at pressure. Yes, =
very frustrating. Hank<br>-------------------- <br><br>From: "Michael =
Salter" <michaelsalter@gmail.com> <br>To: "Hank Leach" =
<gradea1@charter.net> <br>Cc: "Healey team" <healeys@autox.team.=
net> <br>Sent: December 22, 2024 at 2:06 PM PST <br>Subject: Re: =
[Healeys] overflowing fuel into intake drain tube </div>
<div>Very frustrating indeed.
<div>I would comment that I don't =
believe that the needle is really meant to be a "shut off" valve as there =
is always a tiny annular gap between it and the jet. I presume that with =
the suction chamber and piston removed the fuel level is observed to be at =
least 1/8" below the top of the jet.</div>
<div>I can assure you that=
when everything is correct they don't leak.</div>
<div> </div>
<div>M</div>
</div>
<div> </div>
<div class=3D"gmail_quote =
gmail_quote_container">
<div class=3D"gmail_attr">On Sun., Dec. 22, 2024, =
4:11 p.m. Hank Leach via Healeys, <<a href=3D"mailto:healeys@autox.team.=
net">healeys@autox.team.net</a>> wrote:</div>
<blockquote =
class=3D"gmail_quote" style=3D"margin: 0 0 0 .8ex; border-left: 1px #ccc =
solid; padding-left: 1ex;">
<div>
<div> 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.
<div> </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. Both carb pistons drop with a clunk at the same time.=
Turn on key- fuel pump clicking-overflow again leaking. </div>
<div> </div>
<div>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. </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 two =
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.</div>
<div> </div>
<div>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 forked 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 to a stop... but then tick, =
tick which it should not do! Fuel is going out and 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 round? Mind you=
, these carbs have about 125 miles total on them. As far as I know these =
are "genuine SU" parts-not Moss India knockoffs.</div>
<div> </div>
<div>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</div>
</div>
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