Fuel Pressure Question
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Fuel Pressure Question Hi
Any help appreciated.
Car cold - Key on, engine not running
- 52 psi
- pressure leaks down slowly after a few minutes
Start car - at idle till normal temp
- 60 psi steady
- does not drop off
My Haneys manual quotes 55 to 60 psi key on, engine not running, so 52 psi looks a little low. Also, the manual states it should hold steady. My pressure definatley leaked off.
Also, pressure raised to 60 with car at idle. Manual states it should drop 3 to 10 psi at idle. My pressure went up 8 psi.
I tried the key on test, engine not running again after the engine had wormed up. It read 52 psi and then climbed to 54 psi slowly, which is the opposite of when it was cold, when it dropped off.
I plan to replace the fuel filter next weekend.
Is the above normal? Am I misunderstanding my manual? Should the test only be done when the engine is worm? I am thinking, filter, regulator or leaking injector.
Thanks JA
Any help appreciated.
Car cold - Key on, engine not running
- 52 psi
- pressure leaks down slowly after a few minutes
Start car - at idle till normal temp
- 60 psi steady
- does not drop off
My Haneys manual quotes 55 to 60 psi key on, engine not running, so 52 psi looks a little low. Also, the manual states it should hold steady. My pressure definatley leaked off.
Also, pressure raised to 60 with car at idle. Manual states it should drop 3 to 10 psi at idle. My pressure went up 8 psi.
I tried the key on test, engine not running again after the engine had wormed up. It read 52 psi and then climbed to 54 psi slowly, which is the opposite of when it was cold, when it dropped off.
I plan to replace the fuel filter next weekend.
Is the above normal? Am I misunderstanding my manual? Should the test only be done when the engine is worm? I am thinking, filter, regulator or leaking injector.
Thanks JA
Last edited by JGA; Jan 29, 2006 at 03:02 PM.
I'm not sure I'd worry much about what it reads when the engine isn't running. Static pressure is rahter meaningless. As long as it reads ~58 when you are driving (dynamic pressure), you should be ok. If it was a leaking anything, you'd know. Replacing the filter is always a good idea tho.....
Originally Posted by WAHUSKER
I'm not sure I'd worry much about what it reads when the engine isn't running. Static pressure is rahter meaningless. As long as it reads ~58 when you are driving (dynamic pressure), you should be ok. If it was a leaking anything, you'd know. Replacing the filter is always a good idea tho.....
The pump may have a bad leakdown valve but it will not effect the running. It can however make it difficult to start after sitting for a while or over night. Very common the worse it gets you may have to turn the key twice to get the pressure up enough to start the car.
Nate
Nate
thanks for this post. I was just gonna post on this problem as well. Mine is worse though. Mine used to be like yours but now it worse. Now when I start my car its at 58 or so and running goes down to 52. When I stomp it she drops off to 50. Think I'm gonna try the filter first.
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