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HybridZ

Fuel pump or pressure regulator?


Nismo280zEd

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Ok, the other thread was getn' old. I just recently installed a fuel pressure gauge in my car, and upon installation found out that the 260 dollar performace regulator that you get from msa, can work solo as the only regulator on the car. I thought this fixed my problem, as throttle response was very quick and smooth, but intermittenly it will act like there is a rev limiter on the engine. I run about 50 Psi at idle on my gauge, when you floor the car, the Psi goes up to about 75Psi, then when you let off the Psi goes to about 25. but when it acts like there is a rev limiter, the Psi goes from 50psi, to 25psi when you put the throttle to the floor.

 

So is this a fuel pump problem? or maybe another relay? any ideas?

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What fuel pump are you running? Most pumps will not flow at that pressure. 75 psi is too high - there is nothing to be gained at those extreme pressures - the stock z system is designed to be run at a base pressure of 37psi. If you need the pressure to flow with stock injectors, fork out the $$ for some bigger injectors and do it right.

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Well... i'm using an Oil/water pressure gauge that reads from 0-150psi. so it might be off, but i don't have a regular pressure gauge to stick on the line to test it. Tonight my car died again and after some parking lot diagnosing w/ my friend, we think the pump isn't pumping enough fuel it sounds rather weak. So either... the psi wore out the pump, or maybe electrical surges? or something else? but keep in mind my car did this before i hooked up the peformance regulator. So i don't think that is what caused it.

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Well it may sound ghetto to you... but is' just an extra theft deturant as i see it. The following day on that monday i went and put a new pump in my car... from the local Autozone.. i had an extra one actually. When we did that, i left the black wire the way it was.. but clipped the green one going to the pump, and wired it into a fused switch counself i have in my car. There for bypassing relay power. Now i turn my car to on, flip the switch powers up to 75psi and about 1 second the start the car and it drops to about 40 psi. The car has been running like this for about a week now with no problems what so ever.

I'm also running only the performance fuel regulator. the oem is not hooked up anymore. So far so good. Just thought somebody could benefit from the knowledge.

2thumbs.gif

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