Won't start after reconditioned fuel injector pump fitted

Hi guys,

Hoping someone here might suggest something I've missed. Just got the reconed fuel injector pump in and the engine turns over but doesn't start.
is there something I should of done with the pump before fitting?

Thanks

Is it a TD4 or L series Diesel engine?

If it's the TD4 - have you ensured everything was reconnected once the pump was changed - IE the multiplug on the back of the pump? If everything is connected, make sure you leave the ignition on for a couple of minutes before starting to allow the low pressure pump to prime the system.

If it's the older L series - the fuel system would have to be bled between the pump and the injectors - the rough idea to do that usually consists of undoing the union on each injector until fuel is pumped out, then retightened.

Hi Bruthar,

Thanks for your reply.

It's a td4 04 and yes everything is back together correctly, took my time doing it as I had previously attempted a repair on the old pump which meant gaining a bit of experience getting it on and off.

I heard that you may need to get the timing adjusted again?

What was the reason for replacing the old pump? Leaking seals?

There is no timing adjustment for the fuel pump on a TD4, all it does is create an extremely high pressure in the rail and then the ECU determines the injector timing.

Did you use the correct tool to hold the injector pump sprocket in place whilst the pump was removed and the new one fitted?

Ah well at least I can forget about timing!

Yes the old pump was leaking, did try to repair but it didn't work. Got a new reconditioned pump.

So really it should be just a plug and play? I know it has something to do with the pump because even though the old pump repair didn't work, the car still started.

Yeah it should really just be plug and play.

If it started okay with the old pump, though it was leaking then the problem has to be down to either the recon pump being faulty, or the fuel system hasn't had the chance to purge itself of air.

Have you tried leaving the ignition on for a few minutes before attempting to crank? This would give the low pressure pump chance to fill the fuel lines.

And with the ignition on, just to make sure - can you hear the low pressure pump working? (Drivers side wheel arch area)

If the LP pump is doing its job and has had chance to remove the air from the system, and it still does not start - it could be a faulty pump. But to confirm this you would ideally need to plug in with diagnostics to confirm there is not enough pressure in the rail.

Ah lovely thanks. I must admit without the pump having any cogs I was struggling i to see how timing could be effected.

I thought I did leave it for a while but maybe that wasn't enough, I tried to start the engine by turning it over then leaving it for a few seconds and then doing it again.

I will try again and see what happens.

Thank you

Okay well keep me posted with the outcome!

Hmm bit strange this, still not starting but there is a high pitched noise coming from the plug that connects to the pump, the noise goes if I disconnect?

I don't think I can hear the low pressure pump either, what sort of sound is it and would the sound be from the front?

I get a strange hissing noise from my injection pump when it is plugged in with the ignition on, but I wouldn't class it as a high pitched noise - your sound seems more like an electrical issue to me - perhaps the pressure regulator.

The low pressure pump makes a low buzzing tone as such, but this should be clearly heard if you put your head next to the drivers side rear wheel with the ignition on, not from the front.

Just a thought - it may be worth seeing if you can put your old injection pump just resting in the engine bay and plug the multi-plug in - see if it makes the same high pitched noise.

If it doesn't, it could point to the pressure regulator being faulty on the new pump.

yea that's a good call, I don't think the wire will stretch so will have to dismantle tomorrow I think. I wonder if I could use the old switch on the new pump?
It really is quit frustrating when something doesn't go to plan lol.

I also gave the low pressure pump a tap and now it sounds like its working, I wonder if that is now faulty? That would be typical just as im trying to fix another fault, great way of confusing me!

Yeah you could in theory use the old regulator on the new pump - I believe it's just a couple of Torx bolts that hold it on? This would probably invalidate any warranty on your recon pump though.

Any luck in getting the vehicle to start since you tapped the low pressure pump and brought it back to life?

Hi Bruthar, very late reply but yes she is going great guns now! Once the fuel pump was 'delicately' tapped the old girl proceeded to start, it's been great ever since.

I would certainly recommend anyone getting a reconditioned pump though, it's so much hassle if your repair hasn't worked.

lsains said:

Hi Bruthar, very late reply but yes she is going great guns now! Once the fuel pump was 'delicately' tapped the old girl proceeded to start, it's been great ever since.

I would certainly recommend anyone getting a reconditioned pump though, it's so much hassle if your repair hasn't worked.

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I wonder how long the tap cure will work...

Richard Martin said:

I wonder how long the tap cure will work...

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On my older TD4 it worked - I used to slam the rear door actually - for about 2 months before I had to get it trailered to the garage when it just wouldn't start at all.

lsains said:

Hi Bruthar, very late reply but yes she is going great guns now! Once the fuel pump was 'delicately' tapped the old girl proceeded to start, it's been great ever since.

I would certainly recommend anyone getting a reconditioned pump though, it's so much hassle if your repair hasn't worked.

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Glad to hear all is well! Happy Motoring!