td5 issues. fuel pump or injector seal?

My disco has just been in for a head gasket at a lr specialist. been skimmed and crack tested all fine and back together. they took it for a road test though and it just died. turns out the fuel pump was knackered, crud in the mesh and it burnt itself out. they put a new one in and i got it back yesterday.
HOWEVER... now the fuel pump is bloody noisy when i turn the ignition, on multiple pitches not just a constant whine noise. and when i try to start it it just turns over but doesnt fire. after 4/5 attempts it'll start but it doesnt much like it. the fuel pump also doesnt stop unless i turn the engine off. i can hear it as i drive. sounds like its under loads of strain.


So any ideas? i thought maybe injector seals when they refitted the head its not been put together quite right and letting air in/fuel out? I can't see any other fuel leaks around although it is a bit damp-but not wet- around the fuel pressure regulator

any help would be great.

Have you tried purging the air out of the system? turn the ignition on and wait for the fuel pump to stop. When it stops, pump the go pedal 5 times. this will start the purge cycle. The pump will now run for 2 or 3 mins. When it stops do it again. It took loads of cycles of this to get the air out of my TD5 the last time I changed the fuel filter. It's beeen fine since though.

i drove it home yesterday though and managed to start it eventually today and it ran. i thought that would suggest that it had been purged. this is why i think there's air getting in somewhere?

simond21 said:

i drove it home yesterday though and managed to start it eventually today and it ran. i thought that would suggest that it had been purged. this is why i think there's air getting in somewhere?

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If you purge the system before you try and start it, it should start first time instead of needing to keep it cranking over which I am assuming was the case this morning. If you purge the system and it starts first time it should start first time next time. If it doesn't it then proves air is getting in rather than air already being in the sytem. You can then take it back to the garage to sort out as they did the work.

had the fuel filter changed and it worked better for a day but now it's back to the same doesn't want to start in the mornings, other than theat it's fine. any ideas?