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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"><div dir=3D"ltr"></div><di=
v dir=3D"ltr">I had a similar issue on a street TR4A=E2=80=A6 but not t=
he fuel pump. My discovery was that there was sludge on the bottom of m=
y (stock) fuel tank that I=E2=80=99d describe as being like translucent gela=
tin. It was invisible to the eye when looking at it through fuel in th=
e tank. It was only visible after draining the tank fully. I sl=
osh cleaned the tank and ultimately decided to replace the tank due to other=
condition issues. Problem solved. It appears the gel had been b=
locking the fuel flow intermittently.</div><div dir=3D"ltr"><br></div>=
<div dir=3D"ltr">This is not as likely a scenario in a modern racing fuel ce=
ll with smooth pit free walls, but I seem to recall the thread started with a=
car that sounded like it had some down time between owners? Maybe the=
re was time for some fuel to degrade.</div><div dir=3D"ltr"><br></div><div d=
ir=3D"ltr">Great thread, by the way=E2=80=A6</div><div dir=3D"ltr"><br></div=
><div dir=3D"ltr">=E2=80=94Justin </div><div dir=3D"ltr"><br><blockquot=
e type=3D"cite">On Aug 15, 2024, at 9:28=E2=80=AFAM, ralph hansen via Fot &l=
t;fot@autox.team.net> wrote:<br><br></blockquote></div><blockquote type=3D=
"cite"><div dir=3D"ltr">=EF=BB=BF<div class=3D"ydp1b9088d7yahoo-style-wrap" s=
tyle=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:1=
3px;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false">Many decades back I ran into a=
fuel issue on my Spit racer. Spent many hours swapping bits in the ignition=
, checked to be sure the pump was pumping etc. No luck. Finally, out of the b=
lue I just by chance decided to tuen the pump on let it run into a dump can.=
Ran good and proper about 10 minutes then it just made noise and no pumpy. R=
eplaced pump, problem solved. </div><div dir=3D"ltr" data-setdir=3D"fal=
se"><br></div><div dir=3D"ltr" data-setdir=3D"false">Ralph </div>=
<div><br></div>
=20
</div><div id=3D"ydpfac9eedayahoo_quoted_3962180690" class=3D"ydpfac=
9eedayahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, sa=
ns-serif;font-size:13px;color:#26282a;">
=20
<div>
On Thursday, August 15, 2024 at 07:36:39 AM CDT, Phi=
lip Gott via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
=20
=20
<div><div id=3D"ydpfac9eedayiv9075604716"><div>It is also im=
portant to make sure the distributor is properly grounded. Putting a ground d=
irectly to the base plate is the best way to go, whether you run points or e=
lectronic pick up such as Pertronix. See photo.<div>No, the regular mounting=
is not a reliable ground. Every connection is a point of possible failure. C=
onsider Base plate to distributor body to pedestal mount to engine block.</d=
iv><div><div><image0.jpeg></div><br clear=3D"none"><div>This has solve=
d more than one (non-temperature related) misfire problem.</div><div>Phil</d=
iv><div><br clear=3D"none" id=3D"ydpfac9eedayiv9075604716lineBreakAtBeginnin=
gOfSignature"><div dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><di=
v id=3D"ydpfac9eedayiv9075604716yqtfd12120" class=3D"ydpfac9eedayiv907560471=
6yqt8925248804"><br clear=3D"none"><blockquote type=3D"cite">On Aug 14, 2024=
, at 6:36=E2=80=AFPM, David Gott via Fot <fot@autox.team.net> wrote:<b=
r clear=3D"none"><br clear=3D"none"></blockquote></div></div><blockquote typ=
e=3D"cite"><div dir=3D"ltr"><div id=3D"ydpfac9eedayiv9075604716yqtfd33995" c=
lass=3D"ydpfac9eedayiv9075604716yqt8925248804">=EF=BB=BF
Hi Andrew,<div><br clear=3D"none"></div><div>I=E2=80=99ve had 3 different pe=
rtonix all not work right. Every time I went back to points, it ran gr=
eat. I=E2=80=99m currently running points with a Bosch Blue epoxy fill=
ed coil. </div><div><br clear=3D"none"></div><div>I have also picked up=
a FAST optical ignition system to start running if/when points start gettin=
g unreliable. I=E2=80=99ve seen a certain fast 250 running that setup,=
and I expect it billet proof pending any excess oil flying around (what, oi=
l on a triumph? LOL)</div><div><br clear=3D"none"></div><div>Your fail=
ure is exactly what I found from pertronix even though they say it =E2=80=9C=
either works or it doesn=E2=80=99t=E2=80=9D but that was not my experience.<=
/div><div><br clear=3D"none"></div><div>Hope that helps!</div><div><br clear=
=3D"none"></div><div>Dave Gott<br clear=3D"none"><br clear=3D"none"><br clea=
r=3D"none"><div class=3D"ydpfac9eedayiv9075604716yahoo-signature"><a shape=3D=
"rect" style=3D"font-size:12px;" href=3D"https://mail.onelink.me/107872968?p=
id=3Dnativeplacement&c=3DGlobal_Acquisition_YMktg_315_Internal_EmailSign=
ature&af_sub1=3DAcquisition&af_sub2=3DGlobal_YMktg&af_sub3=3D&am=
p;af_sub4=3D100000604&af_sub5=3DEmailSignature__Static_" rel=3D"nofollow=
" target=3D"_blank">Sent from Yahoo Mail for iPhone</a><br clear=3D"none"></=
div><br clear=3D"none"><p style=3D"font-size:15px;color:rgb(132, 115, 255);p=
adding-top:15px;margin-top:0px;" class=3D"ydpfac9eedayiv9075604716yahoo-quot=
ed-begin">On Wednesday, August 14, 2024, 4:45 PM, Andrew Devenish via Fot &l=
t;fot@autox.team.net> wrote:</p><blockquote class=3D"ydpfac9eedayiv907560=
4716iosymail"><div id=3D"ydpfac9eedayiv9075604716"><div>
I thought an update might be in order.
<div>Thank you for all the suggestions and ideas. Spoiler - still not fixed.=
</div>
<div>I have removed and cleaned out the bowl/jet lines, the front had black d=
ebris, but I don=E2=80=99t think it was enough to block the line, and it did=
not fix the problem.</div>
<div>Fuel pump. I have checked pressure and delivery from the pump, all is w=
ell. I have now changed to a smaller capacity positive displacement design a=
s there was concern over interaction of the internal and external pressure r=
egulators. Still not fixed.</div>
<div>Could not find any vacuum leak. I=E2=80=99ve had the manifolds off and b=
ack on since this issue has been around with no change. </div>
<div><br clear=3D"none">
</div>
<div>A couple of replies were pretty confident that I have an ignition vs fu=
el issue. As I can=E2=80=99t find any fuel issue, I now suspect they may be r=
ight. I run Petronix ignitor 1149 with their coil 40611. This is the correct=
3ohm set up per Pertronix.</div>
<div> I purchased a new coil from Amazon - but the replacement coil was=
defective and had a misfire from the start which I could ABA with the old c=
oil. Talking with Pertronix the were concerned my new part was not theirs, a=
nd maybe a cheap copy - I returned
to Amazon, now waiting on a coil from Pertronix direct.</div>
<div>As I=E2=80=99m playing with ignition now, what are you guys using for s=
ignal and for coil with good success ? </div>
<div>Thank you for the advice and support - it will be sorted.</div>
<div><br clear=3D"none" id=3D"ydpfac9eedayiv9075604716lineBreakAtBeginningOf=
Signature">
<div dir=3D"ltr">Thank you,
<div> Andrew Devenish</div>
<div>
<div><br clear=3D"none">
</div>
<div>Sent from my iPad</div>
</div>
</div>
<div dir=3D"ltr"><div id=3D"ydpfac9eedayiv9075604716yqtfd81474" class=3D"ydp=
fac9eedayiv9075604716yqt6370378410"><br clear=3D"none">
<blockquote type=3D"cite">On Aug 9, 2024, at 5:10=E2=80=AFPM, Andrew Devenis=
h <gt6racer@msn.com> wrote:<br clear=3D"none">
<br clear=3D"none">
</blockquote>
</div></div><div id=3D"ydpfac9eedayiv9075604716yqtfd49798" class=3D"ydpfac9e=
edayiv9075604716yqt6370378410">
<blockquote type=3D"cite">
<div dir=3D"ltr">=EF=BB=BF Hi Mike,
<div> The first question is a good one. Th=
e car was built for autocross by a guy in Indiana who knew his stuff. Howeve=
r, I bought it from a guy who had bought it to run PIB, but knew nothing abo=
ut race engines. He had run it lean and holed #4. He told
me he had not changed anything, but that is turning out not to be the case.=
(I suspect it holed the piston because I found he had fitted gros jets with=
the float level way too low). </div>
<div> I rebuilt it to same mechanical spec. It ra=
n great but a little lean on the AAU needles for road course, so I=E2=80=99m=
now on AAA. It still runs great, unless it doesn=E2=80=99t =F0=9F=98=81.</d=
iv>
<div> The car has had this issue since I built it=
. At first I thought the obvious - float heights, needle/seat, regulator pre=
ssure etc etc but while it always runs great I have this issues after a few =E2=
=80=9Claps=E2=80=9D.</div>
<div> 2) The car had a Summit racing 3136 pump wh=
ich has around 90GPH and an internal blow off at 7PSI, my regulator is at 4 P=
SI. Today I had taken the pump apart and checked it but all looked OK. I fit=
ted a cheap solenoid pump in its place. Issue still
there.</div>
<div>I had checked both the Summit and now the solenoid pump for flow, there=
is plenty. </div>
<div> As I noted the float bowls are full when it quits r=
unning.</div>
<div> 3) Great point - could be what I have. I know the fuel le=
vel in the jets is fine when not running, but a poor flow from bowl to jet w=
ould change that when running. My O2 is in the collector, so I can=E2=80=99t=
be sure if it=E2=80=99s both carbs or just one. All 4
plugs look very similar, but that is possible as this =E2=80=9Clean=E2=80=9D=
condition is only for a few cycles before it stops - not enough to color th=
e plug. Will check when I can ( unfortunately a busy weekend coming up as I r=
ace sailboats too ). I=E2=80=99ve been thinking it
is heat related, but it could just as easily be time. When I tried to run a=
utocross it started to play up after 10 or so seconds of full throttle (whic=
h I can=E2=80=99t do in my yard). On autocross it would pull like crazy, the=
n go very flat, and then come back on,
repeat. Your idea would do just that ! </div>
<div> 4) always worth a check, but it would have to be somethin=
g that shows up only when hot. </div>
<div> 5) yes, compression good. Between 220 and 225 for all, me=
asured on crank with throttles open.</div>
<div><br clear=3D"none">
</div>
<div> </div>
<div> Thanks also to the other responses that I re=
ceived, I didn=E2=80=99t cc all on my replies in order to reduce the clutter=
=E2=80=A6</div>
<div><br clear=3D"none" id=3D"ydpfac9eedayiv9075604716lineBreakAtBeginningOf=
Signature">
<div dir=3D"ltr">Thank you,
<div> Andrew Devenish</div>
<div>
<div><br clear=3D"none">
</div>
<div>Sent from my iPad</div>
</div>
</div>
<div dir=3D"ltr"><br clear=3D"none">
<blockquote type=3D"cite">On Aug 9, 2024, at 3:51=E2=80=AFPM, Mike Harmuth &=
lt;ofracer@gmail.com> wrote:<br clear=3D"none">
<br clear=3D"none">
</blockquote>
</div>
<blockquote type=3D"cite">
<div dir=3D"ltr">=EF=BB=BF
<div dir=3D"ltr">Hi Andrew, a couple of things to check.
<div>1st, is this a new problem? if so, what did you touch last?</div>
<div><br clear=3D"none">
</div>
<div>2d Verify fuel flow, not just pressure i.e Gallons per hour? Disco=
nnect the fuel line at the carbs, and stick it into a 1 quart or one gallon c=
lean/clear bottle/jug. Turn the fuel pump on and time how long it takes to f=
ill (1 Qt/ 1Gal whatever size container
you're using). If you're getting more than 20 gallons per hour, the f=
low is OK. Set the bottle aside and let it settle out, look for particles, r=
ubber, fuel cell foam, dirt. If so, see where that's coming from. For exampl=
e, old fuel cell foam will break down
and clog the intake. When the pump turns off, the fuel in the lines drops b=
ack flushing the intake clear until next time. Fuel filter clean? Fuel press=
ure reg OK? Not just holding pressure (I run 3.5 on my HS4s) but actually se=
nding fuel down the line? The
gallons per hour test will indicate if you need to look into any of these a=
reas, if you're gelling enough fuel, more down the list for now.</div>
<div>link to flow and fuel requirements chart <a shape=3D"rect" href=3D=
"https://historicracinggroup.com/resources/Reference_Material/Canton/Fuel%20=
Consumption%20and%20Flow%20Quick%20Ref%20by%20CM%20Filters.pdf" rel=3D"nofol=
low" target=3D"_blank">https://historicracinggroup.com/resources/Reference_M=
aterial/Canton/Fuel%20Consumption%20and%20Flow%20Quick%20Ref%20by%20CM%20Fil=
ters.pdf</a></div>
<div><br clear=3D"none">
</div>
<div>3. A problem I had with an identical set up, was rubber hose break=
ing down and settling into the little box shaped well in the carb bowl w=
here the line to the jet connects. It's happened to me twice now, last t=
ime was in June with fairly new hose feeding
the carbs. It restricted the flow to the jet, even though the bowl was full=
. At high load, not enough fuel could get past the blockage.</div>
<div>
<div><IMG_20240630_112925914.jpg></div>
</div>
<div><br clear=3D"none">
</div>
<div>4. Vacuum leak- Is there a crack or loose bolt on the intake manifold? W=
ith the engine running, spray carb cleaner around the manifold to block, car=
bs to manifold. A change in engine RPM means something was drawn in through a=
gap.<br clear=3D"none">
</div>
<div><br clear=3D"none">
</div>
<div>5. Compression check- Are all the cylinders within 5-10% of each other?=
</div>
<div><br clear=3D"none">
</div>
<div>Happy hunting</div>
<div><br clear=3D"none">
</div>
<div>mike h</div>
</div>
<br clear=3D"none">
<div class=3D"ydpfac9eedayiv9075604716gmail_quote">
<div dir=3D"ltr" class=3D"ydpfac9eedayiv9075604716gmail_attr">On Fri, Aug 9,=
2024 at 3:03=E2=80=AFPM Andrew Devenish via Fot <<a shape=3D"rect" href=3D=
"mailto:fot@autox.team.net"; rel=3D"nofollow" target=3D"_blank">fot@autox.tea=
m.net</a>> wrote:<br clear=3D"none">
</div>
<blockquote style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,=
204,204);padding-left:1ex;" class=3D"ydpfac9eedayiv9075604716gmail_quote">
Guys, <br clear=3D"none">
My car ( 1300, 12.5:1 comp on Sunoco 110 r=
ace gas, dual HS4 ) is still giving me grief. I=E2=80=99ve chased all the th=
ings I can think of, but still same problem. It starts and runs great, but a=
fter a few laps of the yard ( 5-6, only 1000ft or so per up/down
lap, so quick accels then braking to turn ) it goes very lean ( I have O2 s=
ensor ) and stops. I=E2=80=99m running it without the hood for these test ru=
ns. It always stops at the entry to a turn.
<br clear=3D"none">
I=E2=80=99ve been working on it a lot, so k=
now it has fuel pressure, and the float bowls are full of fuel. All plugs lo=
ok very similar. The needles (AAA) are the spring type, and the slides move f=
reely. I use ATF as fluid, but have tried 50 weight too.<br clear=3D"none">
After a minute or so it will fire back up, but o=
nly run enough to get back to the shop before going lean again. If I pull ou=
t the choke it will run, but is unstable.
<br clear=3D"none">
I have wrapped headers and a heat shield around t=
he carbs but they do still get hot.<br clear=3D"none">
<br clear=3D"none">
Any ideas ? Thinking to try some less volat=
ile fuel as it seems heat related and the Sunoco evaporates so fast !<br cle=
ar=3D"none">
<br clear=3D"none">
<br clear=3D"none">
Thank you, <br clear=3D"none">
Andrew Devenish<br clear=3D"none">
<br clear=3D"none">
Sent from my iPad_______________________________________________<br clear=3D=
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