No fuel pressure with the key "on". | Ford Explorer Forums

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No fuel pressure with the key "on".

Dan916

New Member
Joined
October 8, 2009
Messages
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City, State
Sacramento,CA
Year, Model & Trim Level
'97 XLT
The other morning I go to start my '97 xlt and it would not start. It was cranking but wouldnt turn like it wasnt getting spark or fuel... tried 3 days in a row still nothing. Had a mechanic come check it out on the 4th day and without even opening the hood he gets in and it starts right up. For a week after that I didnt drive it no where, but started it daily almost hoping it wouldnt start so I could have someone pinpoint but still continued to start up every time.

So I started driving again hoping not to get stranded, acceleration seems a lil slow on the freeway so I changed the plugs n wires but still doesnt feel right. Went out and got a fuel pressure tester and got ZERO pressure at key "on" but engine still off im not sure if it may of spiked for a second right after i turn the key since I didnt have anyone to look but was all the way at zero in the 2 seconds it took me to come around. Started it up not sure how with no pressure and it slowly creeped up to 28psi in about 20 seconds then remain there at idle.

Im thinking weak fuel pump or check valve.. What are u thoughts? should I be looking at the regulator first??

:scratch:
 












Welcome to this forum! I've moved your thread into the stock 95-01 section. Does your fuel tester maintain any pressure after the vehicle is turned off? You might have a leaky injector.

I believe it maintained pressure because I remember a fair amount of fuel coming out thru the pressure realease valve tube of the tester after I finished. But I will double check tomorrow because a leaky injector would make sense of the situation.
 






Fuel pressure

I believe it maintained pressure because I remember a fair amount of fuel coming out thru the pressure realease valve tube of the tester after I finished. But I will double check tomorrow because a leaky injector would make sense of the situation.

My Haynes Repair Manual provides the following:

Fuel pressure at idle
Vacuum hose attached: 30 to 45 psi
Vacuum hose detached: 40 to 50 psi
Fuel system hold pressure (5 minutes after engine Off): 30 to 65 psi
Fuel pump pressure maximum: 65 psi

If the hold pressure is less than specified:
a) The fuel lines may be leaking
b) The fuel pressure regulator may be allowing fuel pressure to bleed thru to the return line
c) A fuel injector(s) may be leaking
d) The fuel pump may be defective
 






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