XJ XJ6 / XJ8 / XJR ( X350 & X358 ) 2003 - 2009

2004 XJR - fuel pump repair and replace - RESOLVED

 
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Old 05-05-2019, 06:35 AM
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Default Fuel pumps

OK sorry for opening an old post. I have had a mechanic replace the both pump motors but not the bodies as per this post. As he suspected they had failed. He is now got pressure at the rail. But the engine is now getting flooded with fuel. He thinks the check valves might be stuck open. Is this likely? He saying the only possible solution now is replacing the whole pumps with secondhand pumps. Any thoughts on this
 
  #62  
Old 05-05-2019, 06:40 AM
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Martyn,

Give us details of your car, year, mileage etc and the Forum will be better able to comment.
Also some history as to what situation/running problems lead to the replacement of the fuel pumps is usually very helpful
 
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  #63  
Old 05-05-2019, 08:04 AM
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Hi Paddyx350
I think you have been helping me elsewhere with this. My original post is here
https://www.jaguarforum.com/showthread.php?t=113337

Anyway my car is an xjr x350 2003 approximately 130000miles. Symptoms were lack of power and feeling held back. This evolved into revs dropping and then refusing to start. After leaving it a while you could just manage to get it home. Normally it wouldnt throw any codes. I have already changed fuel filter and fuel pressure sensor to resolve a previous over fueling problem. After trying isolate the problem I to took it to a garage specialist in JLR. He was struggling to diagnose as the issue was sporadic. Although in my opinion the low performance was always there. Eventually it broke down on him. He said the pumps had failed and hence we went ahead and replaced the two pump motors.

Martyn
 
  #64  
Old 05-05-2019, 10:33 AM
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Originally Posted by Martynxjr View Post
He is now got pressure at the rail. But the engine is now getting flooded with fuel. He thinks the check valves might be stuck open. Is this likely? He saying the only possible solution now is replacing the whole pumps with secondhand pumps.
Hi Martyn,

The check valves always allow fuel to flow from the pumps to the fuel rail. When a check valve fails, it then allows fuel to also flow backward, from the fuel rail into the fuel tank. I don't think there is a check valve failure mode that would contribute to engine flooding.

Is the fuel pressure too high now? Is DTC P0193 flagged? How is the mechanic monitoring fuel pressure? Via the Schrader valve on the fuel rail or via OBDII?

Cheers,

Don


 
  #65  
Old 05-05-2019, 10:42 AM
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Hi Paddyx350
I think you have been helping me with this elsewhere. My original post

https://www.jaguarforum.com/showthread.php?t=113337

Anyway initially my x350 xjr 2003 130000 mile was lacking performance and holding back. It evolved into loosing revs then cutting out. It would then struggle to start unless left for while. It wouldn't normally throw a code. Took it to a garage specialist in jlr. The mechanic was struggling to diagnose because the problem was sporadic. Although to me it was always lacking power even if it wasn't stalling. The car broke down on him and said the pumps were nackered. So he replaced the motors as per above post. He now says the engine is flooding with fuel and that the check valves must be stuck open. Thinking about it would this result in fuel leaking back to the tank and loosing pressure?
Any thoughts anyone?
 
  #66  
Old 05-06-2019, 12:38 AM
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Thats what I was thinking. Isnt there also a pressure relief valve. Could that be stuck closed? Is there just one pressure relief valve?
 
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Old 05-06-2019, 12:51 AM
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Hi Paddyx350
I think you have been helping me elsewhere with this. I have tried to repost my original post here. A way my car is an xjr x350 2003. The car first felt like it was lacking power but this was all the time. Then it started to loose revs and cut out. It would fail to start. Normally you could eventually get it to start after a while. I then took to the garage which is specialist in JLR. He was struggling to diagnose because it was running OK. It then broke down on him and he said the pumps had gone. So he changed the pump motors as above.
Previously the car had a new fuel pressure sensor and fuel filter to cure an over fueling problem.
 
  #68  
Old 05-07-2019, 04:18 PM
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Mechanic has stated fuel pressure was 60 psi. Pressure sensor high fault logged. He didnt confirm if this was with a mechanical gauge reading or obd. Communicating via text as he has gone on holiday.
 
 
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