Fuel Pressure @ Rail
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Fuel Pressure @ Rail
I have 40 psi @ the rail with the key on - engine off - fuel pump on, and about 33 psi with the engine running @ 1100 rpm w/ transmission in neutral.
Do these readings indicate that the fuel delivery system is good?
Vehicle: 1988 F-150 302 AOD
Do these readings indicate that the fuel delivery system is good?
Vehicle: 1988 F-150 302 AOD
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From: Easton,Ks
Originally Posted by grena
I have 40 psi @ the rail with the key on - engine off - fuel pump on, and about 33 psi with the engine running @ 1100 rpm w/ transmission in neutral.
Do these readings indicate that the fuel delivery system is good?
Vehicle: 1988 F-150 302 AOD
Do these readings indicate that the fuel delivery system is good?
Vehicle: 1988 F-150 302 AOD
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I don't mean to hijack the thread, it's just basically the same question, and the original has been answered, so why not: How long should that 40PSI be there with the engine off? Mine only lasts a second or so, then drains out? Bad fuel regulator or something?
In answer to the original question as well, those readings are about the same as mine, except for the whole few seconds thing....
In answer to the original question as well, those readings are about the same as mine, except for the whole few seconds thing....
Last edited by kc7smo; Feb 28, 2006 at 07:49 AM.
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From: Easton,Ks
Originally Posted by kc7smo
I don't mean to hijack the thread, it's just basically the same question, and the original has been answered, so why not: How long should that 40PSI be there with the engine off? Mine only lasts a second or so, then drains out? Bad fuel regulator or something?
In answer to the original question as well, those readings are about the same as mine, except for the whole few seconds thing....
In answer to the original question as well, those readings are about the same as mine, except for the whole few seconds thing....
May want to check it ever once in a while but if it is starting and running OK and holding for a second or so it is properly OK.
I think you have properly hijacked the thread but we will see.
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I never actually measured how long it held 40 psi after turning off the engine, but it held for at least 5 minutes...
So, correct me if I am wrong, but these readings (33 psi while running and 40 w/ engine off) verify that the fuel pump, fuel filter, fuel pressure regulator and everything else associated with these parts (electrical and mechanical) are in proper working order.
So, correct me if I am wrong, but these readings (33 psi while running and 40 w/ engine off) verify that the fuel pump, fuel filter, fuel pressure regulator and everything else associated with these parts (electrical and mechanical) are in proper working order.
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From: Easton,Ks
Originally Posted by grena
I never actually measured how long it held 40 psi after turning off the engine, but it held for at least 5 minutes...
So, correct me if I am wrong, but these readings (33 psi while running and 40 w/ engine off) verify that the fuel pump, fuel filter, fuel pressure regulator and everything else associated with these parts (electrical and mechanical) are in proper working order.
So, correct me if I am wrong, but these readings (33 psi while running and 40 w/ engine off) verify that the fuel pump, fuel filter, fuel pressure regulator and everything else associated with these parts (electrical and mechanical) are in proper working order.
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From: Otsego, MN
As fas as the seconds or minutes of fuel rail pressure after shutting off the engine, I did mine few months ago when checking pump and changing Press.Reg. My pressure stayed up for about 3-5 min, until dropping.
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I wonder if my injectors are leaking. After the truck has been running, it starts hard...Starts in a second when cold.
How does one test the injectors?
How does one test the injectors?
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From: Easton,Ks
Originally Posted by kc7smo
I wonder if my injectors are leaking. After the truck has been running, it starts hard...Starts in a second when cold.
How does one test the injectors?
How does one test the injectors?
As far as testing them on the engine, I have not ever tried but if you have Regulated Air you could try putting about 25 psi at the fuel test point and lessen at the TB and see if you hear anything. Make sure you loosen the gas caps before you try this and let us know if it works. If you hear air leaking then I would think you would have a leaking injector.
If anybody else has any ideas on testing injectors let us know.
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mine does almost the samething, but it is hard to start hot or cold. I am going to replace my FPR tonight and see if that helps. I have done everything else.... both new pumps, new filter, new plugs, wires, cap, module..... BTW
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mine does almost the samething, but it is hard to start hot or cold. I am going to replace my FPR tonight and see if that helps. I have done everything else.... both new pumps, new filter, new plugs, wires, cap, module..... BTW, checked the plugs and they looked good. Ill let you know if the FPR helps me out... its damn frusterating
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