Car struggles to make fuel pressure

Mitco39

Just got to Vegas, fuel pressure was fine till the temps got up to about 210-220F and the idle fuel pressure dropped down to 40-50PSI and I could confirm that it was low because my AFRs were showing leaner than it was when it was at 58PSI.

I am really starting to think this regulator is being affected by heat and that spring that regulates pressure is getting weaker with the heat.

Possible?

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2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
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instroke

Stay outta high boost, have a good time in Vegas! And a safe trip back.

phunk

Never heard of it happening before but I suppose anything is possible. I'd still bet on the mystery brand pump. Unfortunately its unlikely to be diagnosed fully until you begin the process of elimination.

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Mitco39

Charles, I swapped out the pump with the aeromotive 340 so its got a brand new good pump in it with 10ga running all the way back to the tank.

Its so bad that when heat soaked and hot it struggles to start. Cold it fires up just like stock. I will get another regulator to try while im down here if I can find a place with one. Makes me wonder if I should be mounting it somewhere away from the heat, although there isn't many other choices on our car. The other thing I can try is setting the idle pressure with the system hot. That means however that it will idle at a much higher fuel pressure when colder.

__________________
2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html