I've encountered this problem many times myself. It first started on a hard right hand on-ramp with an incline. I was at about 1/4tank, I starved the car so bad that it died. Couldn't get it re-started either.
Fuel gauge went completely to 0 dots, tow truck driver thought I had just ran it dry and was an idiot. After we got to Nissan, enough fuel had made its way back over to the other side that it started right up and I was at 1/4 tank again. (Only mods at this point was a tire upgrade to some 285up front and 305's in the rear)
Once I figured out the issue, I decided to do some testing. Turns out I could run into some hiccups on the on ramp with over 3/4ths a tank of fuel.
Add in some turbos, and now while Autocrossing I can get it on a sweeping right hand turn if I don't fill up every other lap. I initially thought it was my tune breaking up, until I decided to go get some more gas. Which solved the problem immediately. So below like 95% full I can make it happen.
I'm just going to end up going with an external tank and probably a return system. Any tips for that Phunk?
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