High pressure fuel pump replaced but now wont start...(vaux)

[ToMeToYou]

So i've replaced the high pressure fuel pump due to random intermittent limp mode and pulling a fuel pump code.

I bought a used pump and was a bit of a pain to fit, fan belt off, cambelt off..etc.

All back together and now it wont start, I have cranked it about 7 or 8 times yesterday and although it seemed like it was about to start, it didn't. Also it might have sounded a tiny bit like a tractor, you know, like an injector wasn't working. Even though the injectors are fine.

Is there any specific steps needed when changing a High pressure fuel pump? Perhaps I just need to be persistent, or.. the pump is bad...eeek.

Astra J 2010 1.7 cdti.

Thanks

[Saleen836]

Being a diesel it will need priming,has this been done?

[ToMeToYou]

Saleen836 said:

Being a diesel it will need priming,has this been done?

I did not think of that, didn't realise it required a manual bleed.

How would one prime this? any special bleed nipple anywhere or need any special tools?

Edited by ToMeToYou on Thursday 9th April 11:52

[paintman]

Likely the disconnection of the fuel line has allowed the line to drain back to the tank.
Quick google shows lots of threads on the subject. Random one as a starter :
https://www.vauxhallownersnetwork.co.uk/threads/as...

Edited by paintman on Thursday 9th April 12:16

[ToMeToYou]

Thanks for that but it seems like I have a fault code now. I'm not sure if lack of fuel or air in the fuel system would cause this?

Edited by ToMeToYou on Friday 10th April 11:58

[ToMeToYou]

Here's the fault codes I have after replacing the high pressure fuel pump:

P0103 - MASS AIRFLOW (MAF) SENSOR CIRCUIT HIGH FREQUENCY
P0110 - INTAKE AIR TEMPERATURE (IAT) SENSOR 1 CIRCUIT
P0016 - CRANKSHAFT POSITION INTAKE CAMSHAFT POSITION NOT PLAUSIBLE
P0513 - IMMOBILIZER KEY INCORRECT

No cables were damaged, everything is plugged in correctly, i've stripped it back down to see if the timing belt skipped a tooth or if the timing was out, which it wasn't. Im a little stumped as to why its developed these problems after replacing the fuel pump.

Any ideas?

[paintman]

Think you need to ask this on a Vauxhall engine specific forum.

[Smiljan]

You'd need to do some research on your engine but typically some pumps are coded to the cars ECU and can't just be swapped over without having the memory wiped. I'm not sure which year Vaux stopped doing this but they certainly used to.

Are all those codes current and not able to clear or are they just historic fault codes in the memory?

Edited by Smiljan on Friday 10th April 12:39

[ToMeToYou]

Smiljan said:

You'd need to do some research on your engine but typically some pumps are coded to the cars ECU and can't just be swapped over without having the memory wiped. I'm not sure which year Vaux stopped doing this but they certainly used to.

Are all those codes current and not able to clear or are they just historic fault codes in the memory?

Edited by Smiljan on Friday 10th April 12:39

I looked into replacing the pump a while back and did ask on a vauxhall forum if it needed coding, they said that it didn't.

These codes are all new.

Although, after erasing 2 or 3 times throughout the day, I now only get one code:

P062A - Fuel pump relay control circuit.

[aka_kerrly]

I suspect all the extra fault codes are voltage related from cranking it over so much and draining the battery.

I used to own a Saab 2.2diesel which after running out of fuel required lots of cranking whilst pressing the little shredder valve on the fuel rail. Took my battery plus the AA VW Transporter to get it to start. After running for five min, switched off, restarted as normal.