A4 B7 2.0TDI starting problem!

[Jack96]

I have a 2007 audi a4 2.0tdi140,
The battery died a couple of weeks ago and when I went to start it after charging the battery it cranks over for ages but won't start. Sounds like there is no fuel and I can't hear the pump priming.
The scan came back with no faults, I've checked and there is power to the fuel pump and fuel pump fuse, I swapped it out for another pump unit and there is still no priming.

Any ideas what to look at next?

 

[Robbyb]

I have a 2007 audi a4 2.0tdi140,
The battery died a couple of weeks ago and when I went to start it after charging the battery it cranks over for ages but won't start. Sounds like there is no fuel and I can't hear the pump priming.
The scan came back with no faults, I've checked and there is power to the fuel pump and fuel pump fuse, I swapped it out for another pump unit and there is still no priming.

Any ideas what to look at next?

Is there 12 volts coming through the pump connector?


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[Robbyb]

Is there 12 volts coming through the pump connector?


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Could be air in the lines. Also definitely check the fuel filter.


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[Jack96]

Is there 12 volts coming through the pump connector?


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Can't remember exactly what it was but it was under 12v with the battery connected with it being a bit weak, tried starting it from my jump box though and it was still just cranking

 

[Robbyb]

Can't remember exactly what it was but it was under 12v with the battery connected with it being a bit weak, tried starting it from my jump box though and it was still just cranking

Ok there like I said check fuel filter. I know they can be a real problem on these. I tried a jump box on mine and it couldn’t start it. They have to be powerful ones to start Diesel engines.


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[Jack96]

Could be air in the lines. Also definitely

Ok there like I said check fuel filter. I know they can be a real problem on these. I tried a jump box on mine and it couldn’t start it. They have to be powerful ones to start Diesel engines.


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Okay cheers I'll check that next, do they normally get blocked? Any way to check them or just replace and see what happens? Think it was only changed 6 months ago

 

[Robbyb]

Okay cheers I'll check that next, do they normally get blocked? Any way to check them or just replace and see what happens? Think it was only changed 6 months ago

So I had this exact same problem a while ago. I would take the fuel line off that comes from the actual pump then turn the ignition on so the pump primes and see if you get anything through. If yes I would def change the filter next. How long did you crank it for?


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[Jack96]

So I had this exact same problem a while ago. I would take the fuel line off that comes from the actual pump then turn the ignition on so the pump primes and see if you get anything through. If yes I would def change the filter next. How long did you crank it for?


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That's definitely next on my list then, and the longest was probably around 10 seconds, then countless other times hoping something had magically fixed it for me haha

 

[NHN]

As above, remove line to fuel filter from lift pump, see if it pressures up with ignition on, if so then reconnect & check lines post filter for fuel supply.

 

[Jack96]

Checked pump with a 12v supply and it is working however the ignition key will not power on the lift pump, getting fuel past the filter but I tried to start it with the 12v power supply on the lift pump but still no joy

 

[Garrett 69]

Are you sure it's not an immobiliser issue?