This race weekend I was having some issues with fuel and I hope someone on here may be able to help.
The symptoms may have separate causes, but here's what it's doing:
- Gas fume smell in the car. Not vaporizing gas fume smell, but almost smells like I'm breathing through the filler neck. Suspect it's coming from under the hood, as I still smell it when I put my face up to the NACA duct.
- I can go race a full session, even the 45 minute race, and when I shut it down in tech, it will not fire up again. Have to wait 30 minutes or more to start when the engine (or whatever) cools.
- Lines going to & from the regulator in the trunk are warm/hot to the touch after a session. Not sure if this is normal.
- After a couple dyno pulls when things heat back up, I lose 3-5 ft. lbs. below 5300 RPM or so. Hp from 5300 to the limiter is the same both ways.
Again, maybe not all related.
This is on a '99, we are using an Aeromotive 13129 regulator, we replaced the fuel pump and pickup sock, and rebuilt/cleaned the regulator to no avail. We use a fuel pressure of around 55psi. The stock regulator has been removed and we replaced it with a hose that dumps returned fuel on the pickup sock. I don't think anything changed on the car since the last time we raced it in June. Was hotter and didn't have these issues.
Any help is much appreciated.