[Fot] Fuel issue

[David Gott]

Hi Andrew,

If you have fuel pressure, it almost sounds like a coil getting hot and failing.  Working again when it cools off.   What are you running for ignition?  I’ve also had a pertronix do the same thing…

A wise man once told me 90% of carb problems are ignition (and vice versa). Haha.  You know who you are…  I could we way off base….
Dave Gott


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On Friday, August 9, 2024, 2:52 PM, Andrew Devenish via Fot <fot at autox.team.net> wrote:

Guys, 
          My car ( 1300, 12.5:1 comp on Sunoco 110 race gas, dual HS4 ) is still giving me grief. I’ve chased all the things I can think of, but still same problem. It starts and runs great, but after 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 sensor ) and stops. I’m running it without the hood for these test runs. It always stops at the entry to a turn. 
        I’ve been working on it a lot, so know it has fuel pressure, and the float bowls are full of fuel. All plugs look very similar. The needles (AAA) are the spring type, and the slides move freely. I use ATF as fluid, but have tried 50 weight too.
        After a minute or so it will fire back up, but only run enough to get back to the shop before going lean again. If I pull out the choke it will run, but is unstable. 
      I have wrapped headers and a heat shield around the carbs but they do still get hot.

      Any ideas ?  Thinking to try some less volatile fuel as it seems heat related and the Sunoco evaporates so fast !
    

Thank you, 
      Andrew Devenish

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