fuel pressure drops 0 immediately after switching off

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duduglanza

Fresh Recruit
Before I noticed that the fuel pressure will not drop to zero as soon as i switch off the engine, but now the pressure if dropping to zero as soon as i switch off the engine.. what's the problem? ( n.b .. new pump , new fpr and new injectors )
 
weeJohn

weeJohn

Lifer
If you bridge connections B+ and FP in the diagnostic port and turn the ignition to position 2 the fuel pump will run constantly. Its a safe and easy way to check for leaks in the fuel system.
 
D

duduglanza

Fresh Recruit
I tried 3 sets of injectors and the same results!! If there where leakages in the hoses or around the fuel rail i've would have known as i will find fuel on the floor or near the enginebay! .Let us say it is an injector, could it be that when idling/cruising the fuel pressure decreases slowly?
 
Texx

Texx

Super Moderator
duduglanza said:
I tried 3 sets of injectors and the same results!! If there where leakages in the hoses or around the fuel rail i've would have known as i will find fuel on the floor or near the enginebay!
Click to expand...

If there's no leak and you've tried 12 different injectors, either the FPR is faulty or there isn't enough fuel getting to the fuel rail. Have you replaced the fuel filter? Check the pickup on the bottom of the pump isn't blocked and failing that you may need to try another pump and FPR.
 
N

Navi

Member +
lol no.

I think its the FPR not holding the pressure. Second could be injectors leaking, but that would go slow.
 
weeJohn

weeJohn

Lifer
There is a check valve on the top of the fuel pump on the inside, its pushed open when the pump is pumping fuel out of it and when it stops the valve closes and holds pressure in the line. It may be worth taking the pump out and seeing if you can blow air the wrong way through it, if so then the valve may be stuck open or have a bit of dirt holding it open.
 
wildchild

wildchild

Member +
since the day i got my FPR fixed, it falls to zero as soon as i switch off the engine. takes alot of cranking to start up again. the cranking problem came after i changed my distributor from my nonturbo engine to one from a 4efte. before that it will start in just half a turn. my tuner said to fix the distributor that came with the turbo engine that i replaced to my non turbo car. my mechanic had fixed the old distributor to the new engine so that no wiring will be needed.
Now the distributor that came with the turbo engine is fixed and wiring done. has 4efte ecu fixed and wired accordingly. it now takes about 8 turns to start. i hav no clue as to whats wrong. so is my tuner but he says either the check valve is faulty or fpr isnt holding pressure. but once engine is started, fpr gauge reads 3.8 to 4bar/psi
 
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