All Things Mk5 > How to Guides / Troubleshooting

2005 GTI Fueling issues?

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dave1814:
Quick question, how would I know if the problem was the HPFP or Fuel Tank lift pump? I've checked the fuel pressure with VCDS which looks OK, but that was after I got the car going again, so might be an intermittent issue.

muff1991:
My first point would be to investigate the 3rd fault code listed.
That could be the main reason the other 2 faults are being thrown.
Defo replace the fuel filter and check HPFP cam follower.
If all seem to be fine and still no change. Then you could have a dodgy wire or module.
Check the in tank pump pressure to the HPFP and then the rail pressure. You might find the HPFP is trying to make up the pressure in the rail.



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