Modded LT1 Fuel pressure.

1264 Views 6 Replies 5 Participants Last post by gtodude, Mar 6, 2013

red96tam6

Discussion Starter · Mar 6, 2013

So i've just added a fuel pressure gauge in the cab, with a sender mounted onto the fuel rail at the schrader valve. when i prime the fuel pump, the pressure jumps to about 42-43, settles around 38, when started it sits at 37-38, while driving under almost any load, the gauge reads 40-42 max. wondering if this is working as intended, car pulls hard, no miss, drives 100% fine. also, when i pull the vacuum line off the FPR, gauge immediately reads 43psi. so im thinking since the fuel pressure is directly related to manifold vacuum, that all of this is normal. the system doesnt bleed, and is what i would consider a very tight system. Anyone differ?

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ShowNoMercy

· #2 · Mar 6, 2013

Seems fine to me, thats what mine used to run at as well.

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red96tam6

Discussion Starter · #3 · Mar 6, 2013

Thanks Show, its been a while since ive been on here, just wanted to bounce the idea and put my OCD mind to rest =).

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shoebox

· #4 · Mar 6, 2013

Normal and within spec.

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red96tam6

Discussion Starter · #5 · Mar 6, 2013

very cool, thanks Shoe.

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Racy Roadmaster

· #6 · Mar 6, 2013

My 96 Roadmaster LT1 with mechanical fuel gauge behaves about the same as yours. Most times it holds fuel pressure for several days,but then sometimes it goes down within a day. I dont know if that is indicitative of a problem or not. ed

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gtodude

· #7 · Mar 6, 2013

My '96 Impala SS reads exactly the same

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