well my car has been acting pretty wierd lately and i guessed it was something to do with the fuel since the car wont just fire up when i turn it over... i have to give it some gas before it will do so. so i hooked up the fuel pressure gauge and i have 40 psi at the rails just turning the key to on and then off a couple of seconds later. then after the key is turned off the pressure starts to lower... now that i presume is one problem since i thought it was supposed to stay steady. and i know it is only a little off but isnt the psi at the rail supposed to be 41-47 psi?

so i guess what this thread is about is what is actually wrong with that reading and what can i check to see? i am guessing that i have a leaky injecter since the pressure is getting lower afterwards but i dont know. could the regulator have something to do with it aswell? thanks alot guys

something else i wanted to add is when i do give it gas to get it to start... i have to hold down the gas for a while and slowly the rpms will rise to where they should be. it stumbles and everything until it finally settles where it needs to be and then the car will idle fine

daniel

 

heeeelllllllllllllllllllllloooooooo

 

Stock fuel pressure should be 41 - 47 psi with the vacuum line removed from the fuel pressure regulator. When you first turn the key to ON, not start, the fuel pump primes for about 2 seconds. Fuel pressure will rise to the high 30's with the vacuum line still attached. The pressure should only drop slightly after the pump shuts off, if the pressure drops quickly, then you have a failure to fix. Common causes are a leaky check valve in the fuel pump, leaky injector(s), bad fuel pressure regulator (pull the vacuum line off and see if any gas comes out or a fuel line leak.

 

thank you very much! it is pouring down rain right now, but i will check this as soon as i can. thanks alot