1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

faulty fuel gauge

Discussion in 'A6/S6/Allroad forum (C5 Chassis)' started by martyn brooks, Sep 6, 2009.

  1. martyn brooks
    Offline

    martyn brooks New Member

    Joined:
    Apr 9, 2009
    Messages:
    22
    Likes Received:
    0
    hi have a 2004 tdi c5 4b model a6 ..my problem is fuel gauge shows half full when ignition is on/ engine running. when i put diesel in it rises . but when it returns to just below half yellow petrol warning symbel flashes to indicate empy .and when i turn ignition off fuel gauge goes to zero with all other gauges ,,is this a faulty gauge or fuel sender in tank??? has anybody had simular problems or can any body help with some advice or how to fix ?? all advice and help would much appreciated
    #1
  2. adamss24
    Offline

    adamss24 Well-Known Member

    Joined:
    Jul 3, 2007
    Messages:
    3,331
    Likes Received:
    171
    Is that a quattro model ? The quattros have a split chaimber tank(due to the way the go over the propshaft) and as such they rely on a lift tank to supply the main pump with diesel. Chances are that the lift pump does not work and as such the main chaimber gets empty and it flash the warning light even if the other half a tank is full. It will cost you a few quid though: £250 + for the pump, dealer only !
    #2
  3. martyn brooks
    Offline

    martyn brooks New Member

    Joined:
    Apr 9, 2009
    Messages:
    22
    Likes Received:
    0
    thanks for your reply .. my car is not quattro just single fuel tank? hope you can help again
    #3
  4. Cockney Boy
    Offline

    Cockney Boy Member

    Joined:
    Nov 26, 2007
    Messages:
    481
    Likes Received:
    6
    Sounds like a faulty sender unit.
    #4
  5. martyn brooks
    Offline

    martyn brooks New Member

    Joined:
    Apr 9, 2009
    Messages:
    22
    Likes Received:
    0
    had mechanic look at sender unit and he said it looks fine and that i have infact got half at of diesel .so took car for a run and sure enough yellow petrol light lit up and bleeped when it went down to bang on half full on gauge ??? could this still be the sender unit or as mechanic thinks that the gauge is working but the petrol light coming on may be something to do with the ecu which may need reseting with vagcom or simular??? all help and replys will greatly apreciated
    #5
  6. Cockney Boy
    Offline

    Cockney Boy Member

    Joined:
    Nov 26, 2007
    Messages:
    481
    Likes Received:
    6
    It's either going to be the sender unit, or the gauge, The sender unit is the easier of the two to change, so thats where i would start.
    #6

Share This Page