Posted January 8, 200718 yr comment_195016 77, is the fuel pressure supposed to bleed down over night. have gauge installed to monitor, this is a new project so not a bigf deal right now, but have noticed the oil is real thin, prob gas in it, and the plugs dont look terribly bad?? thinking maybe one of the injectors is leaking? Link to comment https://www.classiczcars.com/forums/topic/22885-fi-fuel-press/ Share on other sites More sharing options...
January 8, 200718 yr comment_195020 It should hold the pressure over night. Theoretically, it should hold it indefinately as long as there are no leaks. Link to comment https://www.classiczcars.com/forums/topic/22885-fi-fuel-press/#findComment-195020 Share on other sites More sharing options...
January 8, 200718 yr comment_195022 My 77 doesn't hold pressure either, but I've got a fuel cell and an aftermarket rail, so I'm not so sure that whatever the mechanism is for keeping the pressure up with the pump turned off is working in the same way. I don't have the charcoal canister anymore, but I am still using a stock pump with the damper still in place. I always thought the damper acted as a sort of anti-drainback mechanism, but evidently that's not the case. When I turn off the pump, the fuel pressure gauge on my rail goes from 45 psi down to about 10, then if left long enough, to 0. I just put my fuel pump on a switch and let it run for a few seconds before I start the car. Link to comment https://www.classiczcars.com/forums/topic/22885-fi-fuel-press/#findComment-195022 Share on other sites More sharing options...
January 8, 200718 yr comment_195033 The check valve on the stock fuel pump is actually the anti drainback device. All the damper does is smooth out the fuel pulse. Link to comment https://www.classiczcars.com/forums/topic/22885-fi-fuel-press/#findComment-195033 Share on other sites More sharing options...
January 9, 200718 yr comment_195153 #1 check for fuel injector leaks, including the cold start injector.#2 the check valve might need replaced that is in the electric fuel pump.More than likely the problem is one or more of the injectors leaking. Link to comment https://www.classiczcars.com/forums/topic/22885-fi-fuel-press/#findComment-195153 Share on other sites More sharing options...
January 9, 200718 yr Author comment_195208 thats whatn i thought, something else to add to the list. Link to comment https://www.classiczcars.com/forums/topic/22885-fi-fuel-press/#findComment-195208 Share on other sites More sharing options...
January 20, 200718 yr Author comment_196255 Is there a way to test each injector for leaking while they are still installed? Link to comment https://www.classiczcars.com/forums/topic/22885-fi-fuel-press/#findComment-196255 Share on other sites More sharing options...
January 20, 200718 yr comment_196258 Not that I know of. Link to comment https://www.classiczcars.com/forums/topic/22885-fi-fuel-press/#findComment-196258 Share on other sites More sharing options...
January 20, 200718 yr Author comment_196271 of course not, oh well, just another project anyway. Link to comment https://www.classiczcars.com/forums/topic/22885-fi-fuel-press/#findComment-196271 Share on other sites More sharing options...
January 20, 200718 yr comment_196280 When I overhauled my injector rail (In February,) I still had loads of pressure on it after I put the car away in November. That's probably what's up with mine; I soaked it in evapOrust to clean up the outside, and some of it probably got inside. So at WOT, I don't get full fuel pressure. Link to comment https://www.classiczcars.com/forums/topic/22885-fi-fuel-press/#findComment-196280 Share on other sites More sharing options...
Create an account or sign in to comment