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2002 2.5l Fuel Pressure Issue w/ New Pump

 
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Old 06-30-2019, 09:22 PM
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Default 2002 2.5l Fuel Pressure Issue w/ New Pump

Searching here, I haven't found an example of what I'm seeing with my '02 2.5l X-type.

The car has a hard start and the fuel rail does not maintain any pressure without the engine running. Once running, the car runs and drives like normal and the fuel trims are good. I replaced the fuel pump less than a year ago, it has maybe 5k on it.

With the car running the fuel pressure is 48 PSI with a mechanical gauge and 54 PSI according to my scanner. Once I shut the car off, the pressure drops drastically to zero. Putting the car ON will initially pressurize the rail but it maybe lasts 1 second before going back to zero.

Here's a video showing running, key off, key ON and re-starting.


I know this system is return-less with a pressure sensor being used to modulate the pump. It seems like there's no issue with the pressure sensor and I'm guessing the injectors aren't leaking since the fuel trims are good and there's no misfire.

Is there a check valve in the pump like other cars?

Any other ideas?
 
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Old 06-30-2019, 10:04 PM
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Last edited by Dell Gailey; 06-30-2019 at 10:07 PM.
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Old 07-01-2019, 08:29 PM
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I doubt the pressure senor is faulty since it's relatively close to the mechanical gauge and changes just the same.

Are there established symptoms for a faulty fuel control module? Other than no pressure? I didn't see anything that matches my symptoms.

Sleeping on it, I'm leaning more to a faulty pump check valve.. even though it's new.
 
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Old 07-02-2019, 02:33 AM
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There is no check valve that I'm aware of in fuel system/pump.

Heed post #5 =

https://www.jaguarforums.com/forum/x...m-pump-167543/

Heed the p1338 part of pin out =

https://www.justanswer.com/jaguar/36...-2500-rpm.html
 

Last edited by Dell Gailey; 07-02-2019 at 03:19 AM.
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Old 07-02-2019, 03:45 AM
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How else would pressure be maintained after the key on priming of the system or after the car is shut off?

The posts you linked dont match my symptoms. I have good pressure when running and zero issues driving.
 
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Old 07-02-2019, 02:53 PM
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Pressure is not maintained when you shut the key off. Thus the reason the fuel pump (controlled by modules and electronics) "primes" the system by running for a few seconds (if you don't immediately turn key to start) & then shuts itself off. Also why when many off these cars begin to have a failing fuel pump, you can turn the key on, wait for pressurization and then get it to start. I nursed mine for months before it gave up the ghost.

These cars are equipped a bit different than many because the fuel system does not have a return to tank system of fuel.
 
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Old 07-02-2019, 04:19 PM
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Return system or not, all EFI cars prime the system to make up for pressure loss after sitting. Pressure isn't going to be completely maintained and it will slowly depressurize on it's own. This is why you bleed the system manually at the schrader valve before working on the fuel system.

You described priming on this car the way I understand it to work on everything else. But the pressure shouldn't go back to zero PSI immediately after the pump stops, otherwise the prime would serve no purpose. If there's no check valve, the pump must be the positive displacement, one direction flow type and maybe that is acting up.

My car primes the system at key on, as it should, but the pressure bleeds off immediately following the prime.
 
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Old 07-02-2019, 09:13 PM
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https://www.jaguarforums.com/forum/x...sensor-210055/

fuel rail pressure sensors monitor the pressure in the fuel rail and report the reading to the engine control module. If any drop in pressure is detected, the engine control module compensates so that the fuel pump can restore the proper pressure. A valve controls this pressure.

https://www.jaguarforums.com/forum/x...e-help-125184/

I guess you know better than anyone else. Good luck with your quest.
 

Last edited by Dell Gailey; 07-02-2019 at 11:48 PM.
 
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