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audi b6 cabrio 2.5tdi wont start . can you normally hear fuel pump in tank

steve elliott Apr 21, 2020

  1. steve elliott

    steve elliott New Member

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    Hi Guys cars been sitting for a while tried to start it the other day ,just turns over.No smoke so definetely fuel problem . I cant hear the fuel pump in tank when i switch ign on. Is this normal?
    I pulled the plug off top of tank put a multi meter between brown and green/yelow wire ,and i have power but only in start position .Seems to suggest power only goes to low pressure pump when in start position is this right ? . This would mean i wont hear it , if it is working as sound is drowned out by engine cranking
    Any ideas ?
    Cheers Guys
     
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  3. Mike B

    Mike B Well-Known Member

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    I can only say that I have never heard a pump when starting my Avant or just with ignition on.Hope you fix it
     
  4. steve elliott

    steve elliott New Member

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    Thanks Mike . is yours a 2.5 v6 diesel ?
     
  5. Mike B

    Mike B Well-Known Member

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    It is and its often sat for weeks and then starts first time.
     
  6. steve elliott

    steve elliott New Member

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    Well another foo pah ,as i didnt do the basics .ie crack off the inj pipes! After a few seconds bubbles appeared ,then fuel .secured them and away it went . Dont know why but it appears fuel has dropped back to the tank,despite it having over half a tank . I had drove it out of the garage 3 weeks ago to give it some tlc .It started immediately after sitting in garage for over 6 months . Incidentally tank pump only gets power in start position oddly .ie no priming prior to attempting to start,as is more common i think . I got the missus to turn the key while i listened with a stethoscope .whirring away! .Thats when i cracked off the injectors . Live and learn etc .
     
  7. Mike B

    Mike B Well-Known Member

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    It did sound like air in the fuel line.It might have a leak somewhere which can be hard to trace but strange if it was ok before
     
  8. Mike B

    Mike B Well-Known Member

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    Are the spill pipes ok?
     
  9. steve elliott

    steve elliott New Member

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    Yes was definitely air in system .How it got there is a mystery .It has got 2 what look like aftermarket non return valves in fuel lines, under bonnet ,so maybe its had issues historically !
     

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