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Discussion Starter · #1 · (Edited)
Hi There, I have a 2012 XF, it has 35,000 miles on the clock, full service history. In short it is a very well looked after car. Two weeks ago, I jumped in, noticed it took a little longer than usual to start, but when it did it ran as normal.....for about a mile or so. Then it went into limp home mode, I got it back into my drive, switched it off and it refused to start again. I had it uplifted and taken to a local garage, who diagnosed a failed high pressure fuel pump. They sent the pump to an engineering works, who tested it and said that it was making virtually no pressure at all. Now it gets interesting. I had my doubts about this, had the car removed to an independent Jaguar specialist who installed a reconditioned pump,which is reaching the desired pressure and guess what the car is still not starting, they have checked the sensors diagnostically replaced the fuel filter, and seem to be at a loss as to the cause of the problem.
Sorry this is so long winded, but has anyone else experienced this or have any ideas? I would really appreciate your help.
Many thanks Gary.
 

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Of course there can be multiple reason, but I will try to list from memory the more likely ones.

1 - You may have air in the system and the fuel system (from the fuel tank pick-up/sender unit) to the pump is air locked. There are specific ways to clear that. *** this is my bet ***

2 - You may have a damaged wiring harness or connector that is preventing full fuel pressure.
 

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Hi There, I have a 2012 XF, it has 35,000 miles on the clock, full service history. In short it is a very well looked after car. Two weeks ago, I jumped in, noticed it took a little longer than usual to start, but when it did it ran as normal.....for about a mile or so. Then it went into limp home mode, I got it back into my drive, switched it off and it refused to start again. I had it uplifted and taken to a local garage, who diagnosed a failed high pressure fuel pump. They sent the pump to an engineering works, who tested it and said that it was making virtually no pressure at all. Now it gets interesting. I had my doubts about this, had the car removed to an independent Jaguar specialist who installed a reconditioned pump,which is reaching the desired pressure and guess what the car is still not starting, they have checked the sensors diagnostically replaced the fuel filter, and seem to be at a loss as to the cause of the problem.
Sorry this is so long winded, but has anyone else experienced this or have any ideas? I would really appreciate your help.
Many thanks Gary.
very low mileage/lack or regular usage/lack of high speed runs for a diesel can be bad. Could be a blocked DPF, creating back pressure. Could be similarly blocked EGR valve.

Surely the Jag specialist should be able to get to the bottom of it, from reading the specific fault codes, general experience and so on.
 

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Is it actually pumping fuel now? I had two breakdowns on my previous xf, that looked like it had run out fuel even though it hadn't.
Adding more diesel fixed it both times so it was a problem with fuel pick up a the tank.
 

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Discussion Starter · #5 ·
Hi Mick, As far as I know the new pump is good , but the garage now think that one of the injectors is faulty / damaged. They have ordered some warrantied used ones to test if that is the issue,They have even tested the fuel thats in the tank to make sure its ok, the gauge shows 3/4 full. It does seem hard to believe that a the fuel pump and injectors failed at the same time, unless something has made its way from the pump and caused further damage further along the fuel line.
 

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You are right, it's a little strange as it should still start evn with a couple of failed injectors.
does it not try and fire at all?
Basically a diesel engine from cold needs, fuel (at the right time) and heat from the glow plugs. And that's it. Assuming of course that it spins over.

Oh and compression !
 

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Discussion Starter · #7 ·
So the latest news from the garage is that as well as the fuel pump, all 4 injectors have failed. They reckon the cause can only be contaminated fuel. For convenience I only ever use the Tesco garage which is round the corner from my house. I have the receipts for all my recent fuel purchases and the garage is willing to put in writing that they believe that the fuel was the cause of the damage. I also have a sample of the fuel from the tank. I dont know if I will get anywhere with trying to claim, but you dont try, you dont get lol
 

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The odds of all 4 injectors having failed at the same time as the fuel pump are lower than you winning the lottery without buying a ticket.

There is probably air in the system or some other systemic problem. The sad part of it is that if they follow the proper procedures when replacing the pump and injectors, they are likely to get rid of the trapped air, therefor inadvertently solving the problem.

They may get it right by being wrong.
 

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Hi There, I have a 2012 XF, it has 35,000 miles on the clock, full service history. In short it is a very well looked after car. Two weeks ago, I jumped in, noticed it took a little longer than usual to start, but when it did it ran as normal.....for about a mile or so. Then it went into limp home mode, I got it back into my drive, switched it off and it refused to start again. I had it uplifted and taken to a local garage, who diagnosed a failed high pressure fuel pump. They sent the pump to an engineering works, who tested it and said that it was making virtually no pressure at all. Now it gets interesting. I had my doubts about this, had the car removed to an independent Jaguar specialist who installed a reconditioned pump,which is reaching the desired pressure and guess what the car is still not starting, they have checked the sensors diagnostically replaced the fuel filter, and seem to be at a loss as to the cause of the problem.
Sorry this is so long winded, but has anyone else experienced this or have any ideas? I would really appreciate your help.
Many thanks Gary.
Did you get to the bottom of the problem Gary? I have exactly the same and changed. Both pumps and injectors 😡
 

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Hi There, I have a 2012 XF, it has 35,000 miles on the clock, full service history. In short it is a very well looked after car. Two weeks ago, I jumped in, noticed it took a little longer than usual to start, but when it did it ran as normal.....for about a mile or so. Then it went into limp home mode, I got it back into my drive, switched it off and it refused to start again. I had it uplifted and taken to a local garage, who diagnosed a failed high pressure fuel pump. They sent the pump to an engineering works, who tested it and said that it was making virtually no pressure at all. Now it gets interesting. I had my doubts about this, had the car removed to an independent Jaguar specialist who installed a reconditioned pump,which is reaching the desired pressure and guess what the car is still not starting, they have checked the sensors diagnostically replaced the fuel filter, and seem to be at a loss as to the cause of the problem.
Sorry this is so long winded, but has anyone else experienced this or have any ideas? I would really appreciate your help.
Many thanks Gary.
Hi, I am facing the same problem. Can you please guide how you resolved it? I have been informed the same to change high pressure fuel pump and fuel filters but reading the forums I doubt that!
 
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