i have checked my fuel pressure regulator and my injectors and it sill doesnt hold fuel pressure when i cut the car off ?

 

Mine was replaced in the spring.

My signs:

- Hesitation at high rpms.
- Took longer and longer to start.
- Occasionally stall out after running for 10-15 seconds.

I hope there were the signs you were looking for.

Jeff

 

Mine was harder and harder to start, low fuel pressure everywhere verified via gauge and I could also not hear it prime anymore when the key was placed to the ON position.

 

well mine is hesitating and mine seems not to be holding pressure when you cut it off ...i have replaced the fuel pressure regulator and the injectors and it still looses pressure ...i feel certain thats the problem but thats alot of work to be wrong

 

In another thread, you indicated you thought you had an Aeromotive AFPR. Someone then explained that they do not hold the fuel pressure. Have you considered this?

https://www.camaroz28.com/forums/sho...d.php?t=698700

It appears that in addition to the pressure not holding when you shut it down, that it is also "hesitating". When you checked the fuel pressure out on the road, what pressure did you get at WOT/max RPM? That is the only way to check the fuel pressure under load.

 

i changed the Aeromotive AFPR back to the stock one and it did the same thing so i ruled out the fpr as being the problem , i never was able to check it on the road my guage hooks on the fuel rail and i have to close the hood ...would doing a wide open throttle with out the csr being in gear wouldnt that be the same results?

 

Not really, since you are not putting any real load on the engine. You could try pulling the vacuum line off of the fpr, which will simulate WOT fuel pressure, but its best to take it for a spin and verify.

 

Does the fuel pressure test gauge have a long hose on it? If so, you pull the gauge through the opening between the cowl and the hood, close the hood, and tape the gauge to the outside of the windshield. The hood gasket is about 1" thick, and will allow the hose to exit that way.

In my earlier response, I said:
I thought that was pretty clear. The engine has to be under load. Revving it, sitting in the driveway is useless, since there is no load on the engine.

 

ok i have fixed the hesitation i adjusted the fpr and it has stopped but i set the fpr for 60 psi at idling and it stays 60 at wide open throttle .I cannot stick the guage throgh the back of the hood the hose is to short. I cannot take the vacuum line off because the Aeromotive fpr hose does not use vacuum it has a set screw where the vacum line goes ..i have replaced the injectors and replaced the afr ...i thought maybe power was going to the injectors after cut off of engine. so i pulled all my injector plugs and the pressure still drops to 0 psi the only thing left is the fuel pump ..have i left something out ?

 

Bumping your fuel pressure to 60psi is a serious mistake. The PCM can compensate for the excess fuel flow in closed loop, but when you go WOT the engine is going to run pig rich, and possibly wash down the cylinder walls and damage the rings. Why did you do that? You do NOT tune with an AFPR.

The Aeromotive has a vacuum compensation line connecton. It sticks out the side.

 

what should the psi be set on?

 

mine doesnt look like that one maybe mines not a Aeromotive its just red no black no name ...nothing but it does have a adjustment to set it one whatever you want