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Discussion Starter · #1 ·
Hello everyone

I have a Jaguar xf 3.0 2010 diesel

my issue is car is cranking but no start. I have checked LP pump removed and tested with a 12v supply and it’s filing filter without any issues. HP feed from filter is also ok. but no start.

I have cracked off injector 2 and no fuel. I do have have fuel at 1-3-5 injectors but very low pressure dribbling. 2-4-6 injectors no fuel or dribble.

im very confused and would appreciate anyone help

many thanks
 

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Hi, could it be your high pressure pump, I'm having a problem with mine now. Phil
 

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Get a diagnostics tool on it and view the fuel pressure whilst cranking.

Cracking an injector whilst cranking on a modern diesel is NOT recommended as the pressures involved are incredible.
 

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Discussion Starter · #6 ·
Get a diagnostics tool on it and view the fuel pressure whilst cranking.

Cracking an injector whilst cranking on a modern diesel is NOT recommended as the pressures involved are incredible.
Thank you

I will use diag tomorrow to read fuel pressure, if low would it then be HP pump or could it be injector blowby, but I don’t see any spray ect

thanks again
 

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Apparently on mine the pressure to 3 cylinders dropped to zero when cranking the engine, or so the mechanic says, he says it could be something as simple as the fuel filter causing fuel starvation, or I'm in line for a new high pressure fuel pump (gulp!). I have had to leave it with for further investigation, will report the outcome. Phil
 

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How did this problem start, for example was it running rough before it happened or did you just go to the car one morning and it wouldn't start. I presume you have fitted a new filter (don't rely on dealer service having changed it) also did it happen after refueling or a service. Did it happen after you did anything to the car. If you get a diagnostic report show us the codes.
 

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Apparently on mine the pressure to 3 cylinders dropped to zero when cranking the engine, or so the mechanic says, he says it could be something as simple as the fuel filter causing fuel starvation, or I'm in line for a new high pressure fuel pump (gulp!). I have had to leave it with for further investigation, will report the outcome. Phil
sounds more like the injector, as it's common rail so if fuel pump/filter all of the rail pressure would be affected?
 

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Apparently it's three cylinders on one side of the engine Gav. Phil
 

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Apparently it's three cylinders on one side of the engine Gav. Phil
ah doh, read the post properly! you said three cylinders and I read no.3 cylinder! could be the rail regulator too though...could swap them over to prove...?
 

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ah doh, read the post properly! you said three cylinders and I read no.3 cylinder! could be the rail regulator too though...could swap them over to prove...?
Ah well it's in the hands of the "professionals" now, I'll let them sort it and rip me off! Phil
 
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Common rail. Fuel enters at one end of the rail, there's a pressure sensor which feeds data to the ECU, there's 6 injectors fed from the rail, at the other end there's a pressure regulator valve, controlled by the ECU, which bleeds excess pressure back to the tank, possibly via the fuel filter. So quite how only 3 cylinders out of 6 are starved is a bit of a mystery.... Maybe the last "working" injector before the first of the 3 starved ones is very fuel pressure hungry and using it all..... You can tell I do not trust "professional mechanics".
 

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You can tell I do not trust "professional mechanics".
Neither do I but at 74 and hands that look like the twigs on a tree after 13 years of Arthritis I have little choice. Phil
 
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Common rail. Fuel enters at one end of the rail, there's a pressure sensor which feeds data to the ECU, there's 6 injectors fed from the rail, at the other end there's a pressure regulator valve, controlled by the ECU, which bleeds excess pressure back to the tank, possibly via the fuel filter. So quite how only 3 cylinders out of 6 are starved is a bit of a mystery.... Maybe the last "working" injector before the first of the 3 starved ones is very fuel pressure hungry and using it all..... You can tell I do not trust "professional mechanics".
Didn't check the WSM assumed there would be two rails, not filtered going back though only from the tank. It's gotta be something in common with those cylinders, so my suspicion lies with the fuel regulator.
 

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Discussion Starter · #16 ·
Apparently on mine the pressure to 3 cylinders dropped to zero when cranking the engine, or so the mechanic says, he says it could be something as simple as the fuel filter causing fuel starvation, or I'm in line for a new high pressure fuel pump (gulp!). I have had to leave it with for further investigation, will report the outcome. Phil
just to confirm is this correct
Hood Motor vehicle Automotive tire Gas Auto part
 

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You can tell I do not trust "professional mechanics"
I tend to agreed but it depends on the mechanic/garage. My advice to anyone is to find a good Jaguar independent specialist. I have used several over the years and always found them to be excellent. I had occasion to use two in the past few months and both were first class. Their Jaguar knowledge is unsurpassed (they only work on Jaguars) and the pride in their work is admirable. The workshop of the last one I used was like an operating theatre, spotlessly clean. Most importantly, their costs are very reasonable. These Jag indies rely on Jag owners like us coming back time after time, unlike the Jag main stealers - who I avoid like the plague.
 
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just to confirm is this correct
View attachment 192318
looks ok but double check with my guide.
 
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Admin please move this to X250
 
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