Quote Originally Posted by 231FUN View Post
I had a pump in a 3800 99 Monte z34 that would work great all day long in cool weather but as soon as summer heat hit it would heat up enough to slowly lose pressure and shut down after it was heat soaked and stall the car out but start back up after some cooling time.
Took me some time to figure out this mystery...lol
Went through ignition, changed MAF and crank sensor before I finally left a fuel pressure gauge hooked up while driving and figured out what the issue was.
Haha yeah man these things are a headache keep you guessing and wondering.