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Originally Posted by decathlondriver
I pushed in the schrader valve earlier today with the key in the 'on' position and it sprayed for less than a second, and then nothing came out. I unhooked the returnline back by the filter and turned the key on, and fuel came out of this line while the pump was heard running. It was not at the same pressure that the fuel came out of the filter though. I am going to see if I can get a hold of a pressure gauge to put on the schrader valve tonight and give it a try. So far I am thinking that the pressure regulator is stuck halfway and letting the fuel bypass.
Do the injectors work off pressure? I guess the real question here is, if the pressure is below 40psi, say 30psi, would any fuel get sprayed into the engine? Also, just by looking at this system, am I right in assuming that the pressure regulator is on the output side of the fuel rail? So that when the rail hits a certain pressure it bleeds off to maintain that pressure with vaccum assist?
Once again, thanks for your help. I'm learning a lot.
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Lynn (GTP Dad) suggested checking your fuel pressure but you did not specify your engine size. The 2.2 Ecotec and 3.4L V6 have different fuel pressure specs. For example the 3.4L will typically have at least 55 psi fuel pressure with ignition to on (not start, pump prime). With engine running the pressure will be higher with vacuum disconnected off the fuel pressure regulator. With engine idling if you see a change of more than 7 psi by pulling the vacuum line off and on then the fuel pressure regulator is suspect. See pic below:
Good luck!