fuel pump characteristic

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  • rs200
    S2Forum Extremist
    • May 2009
    • 1398
    • Home: Croatia

    #1

    fuel pump characteristic

    hy

    can somebody tell me the characteristic of audi s4 and 200 20v fuel pump..

    how much pressure have to be at idle and full throttle...of course when it's NEW.. or good.

    thanks

    Igor
  • driftin jo
    S2Forum Fiend
    • Sep 2007
    • 2222
    • Country: United Kingdom

    #2
    It should be 4 bar + or – whatever the manifold pressure is . I.E if you have 1 bar of boost at full throttle then you should have 5 bar at the fuel rail , if you are at idle and have -.5 bar then it should be 3.5 bar at the fuel rail.

    Comment

    • driftin jo
      S2Forum Fiend
      • Sep 2007
      • 2222
      • Country: United Kingdom

      #3
      Just to add to that it is not just the pump that is responsible for fuel pressure but the fuel pressure regulator also , if you know the FPR is good and you don't get the pressure you should then the pump my be on it's way out and unable to keep up with the demand for more fuel when on boost. It could also be that the fuel filter needs changing as it is restricting flow.

      Comment

      • rs200
        S2Forum Extremist
        • May 2009
        • 1398
        • Home: Croatia

        #4
        hmmmm...
        you sad fuel filter ?
        thanks for advice, because I still have 20 years old fuel filter..

        first I have to check fuel pressure..

        thanks..

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