Okay, this may be a little bit long but please help me out, I’m a little bit desperate. First my jaguar had an issue with the fuel pump and I did not use it for some time (1-2 years) . A mechanic told me that the problem was the pump, we changed it but with 2 days of use the car could not turn on again. I changed it again and the same thing happened between a week, so I just gave up and changed mechanic. The other mechanic told me to bring the whole fuel system and I did, it worked again for a couple of days but it failed again.

The problem continued, I changed mechanic and he told me that something was damaging the fuel pump, and he correctly found that there were 3 problems; some cables where overheating, the codes also showed 2 02 sensors and the fuel rail pressure sensor and he said that just in case we should also change the fuel pressure module. He did changed everything, now the car starts, the fuel pump does not get damaged but the new problem is that he gets a code that the fuel pump looses pressure and when that happens the car does not accelerate, It’s like you press the accelerator but it does not respond, sort of stuck.

He’s only getting the code of lost fuel pressure and the fuel rail pressure sensor, but he says that the fuel rail pressure sensor appears because of the loss of pressure, not because it’s damaged. At this point I believe that we have almost changed everything to be in the fuel system, so he was sincere and told me that he does not know what else it could be. So I have 3 questions; could it be the crankshaft position sensor? Can it be that one hose has a leak or something has a leak? What else can I do? Please help me out.

 

Can you hear the fuel pump run? You may have to remove the rear seat bottom cushion to hear it. Turn the key to Run but not Start. You should hear the pump run briefly to pressurize the injector rail before starting.

If you hear the pump run as normal, there's a line at the pump module that may have come loose, dumping the pump's output back into the tank. See post #19 here:

https://www.jaguarforums.com/forum/s...4/#post2286145


The CKP sensor could also be at fault. See post #3 here:

https://www.jaguarforums.com/forum/s...5/#post2494166

"The fuel pump is also controlled by the CKP, which sends a signal to the PCM that the crankshaft is rotating, If the PCM does not receive the input from the CKP, it shuts off the fuel pump."