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radi180
19-06-2009, 22:49
Cars fuel pressure wont stay level in the car. When pump primes the pressure risses to 50psi and stays there. Once the car starts it idles at 50psi for about 5 seconds then the pressure drops to 20psi. A new walbro pump has been fitted, a fuel filter, fuel pressure gauge and FPR from a car that it definatly works on. The vacuum line to the FPR has been changed too.

Whatever adjustments are made to the FPR the pressure isnt changing. :confused:

If the car is rev'd gently to about 2500rpm the pressure stays at 20psi.

If its rev'd and held at 3000rpm the pressure will rise to about 45psi after about 2 seconds, it always takes the same amount of time. The pressure will stay there and fluctuate between 40-45psi while being rev'd over 3000rpm.

Putting in new fuel lines first thing in the morning
JP
20-06-2009, 02:25
Moving to S13 tech. Simple thing: are the lines in their correct respective ends of the FPR? (Easy mistake) If not, then the next thing I'd check would be whether your vaccuum line is too small/large to maintain the correct pressure to the FPR. (i.e. is it the same size as the one you took off? Is there a split in it? Can you see it attached to the manifold? Might've popped off if not cable-tied on)
radi180
20-06-2009, 07:39
Cheers JP il check all this again and see what the story is. :thumbs:
jhinchy
20-06-2009, 10:40
If you are just reving it while the car is parked it will have a vacuum, it will only increase pressure if the vacuum drops off. disconnect the vacuum line and see what pressure it reads then.
radi180
20-06-2009, 16:45
Ok was up with a mate who is a mechanic today. we found out ther is no return from the fuel rail. He had no time to do anything with it so we said wed work on it monday but for now it should be ok.
So off i went to tullow to test the handbrake and go a bit sideway but all of a sudden i was getting no power. Then was called in and was told I have a leak from the fuel tank. Im hopuing thats the problem. Will know more on monday. Also am geting my injectors tested on monday to make sure there running 100%
g6mmc
07-07-2009, 22:37
how did you fair out with this problem ?
radi180
07-07-2009, 23:27
There wasnt enought power going to the fuel pump. Turns out the relay wasnt working properly :thumbs: . Now i have more problems. Have 40psi compression in one of the cylinders so im busy getting parts to sort that out :mad:
redsx94!
07-07-2009, 23:54
melted piston maybe :(
radi180
08-07-2009, 18:23
I think cracked. As long as the head is ok im not too worried :thumbs: