Quote:
Quote:
Originally Posted by roy 1953
Hi all,
2004 75 cdti diesel. car would not start, found that if the underbonnet pump was given a tap the pump will run and the engine will start.
Have I got an in tank pump as well?, If I have I cant hear it running, so do I need to replace both pumps?.
Would a duff intank pump cause the underbonnet pump to fail?
Thank you,
Roy
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Hi Roy.
Remove the fuel tank cap turn ignition II and listen at the fuel filler for the pump working, another way is to unplug the under bonnet pump, and do the above.
If you need to tap the UBP for it to work then it is faulty & not working as it should, also always keep the fuel above the 1/4 mark if you have a UBP.
Replace only with a good original pierburg pump, after market pumps do not last, or at least a good know second hand pierburg pump.
https://youtu.be/MikZPHxCUww
You could test it into a jar, but if you are having to knock it for it to work maybe not worth while, but do make sure the connection is tight just in case.