Quote:
Originally Posted by 924RACR
I agree with Rasta; while yes, you're cornering in the wrong direction for the sump - these tanks do have a very effective sump, and I've not heard of them running into cutout issues with more than a tank, at least unless something else is bad.
So, as for fuel-related issues, what he said... and it's likely fuel-related. Does your gas tank cap when loosened suck air in hard? That or vice versa is usually a good sign of bad venting.
One more final conclusive proof of it being a fuel level issue, not anything else (like time running) would be to head out with only 1/2 gal more than your bogey, 14 gal, and see if the problem shows up within a few laps - before anything else has had a chance to get hot enough to cause any possible heat-related issues.
Sorry I can't be of more help, but it seems like you're looking at the right bits, may just have overlooked something...
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RE the gas cap, the gas cap seal is actually bad - just ordered a new one. When running track sessions, gas actually leaks out the cap and goes down the side of the car. Not major amount of fuel, but enough to be seen when dirt/dust/rubber dust sticks to it showing streaks on the side of the car. So, if anything, I'm guessing the fuel tank is venting through the cap not allowing vacuum build-up. Very good point to check the normal vent for clogging - possibly there is reverse pressure as you mention. Good point.
I have also narrowed it down to
not being heat related - doing 20 minute sessions, this was my original thought as when the problem occurred, the track session would be over prior to me getting filled up and back on the track. But the 3 hour enduro put that theory to rest with the problem occurring every time 6-7 gallons was used, then fill up and the problem was gone with continuous track time.
My takeaway - I'll replace gas cap seal and check proper venting of tank.