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1990 Avanti Sedan Fuel pump problems

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  • Fuel System: 1990 Avanti Sedan Fuel pump problems

    Hi guys,
    today a 1990 Avanti Sedan rocked into my garage here in the UK. It's no 84 in the build and an all black car.

    The car has 58k original miles on it but has been sitting since 2013

    When I start my 1988 Avanti, I can hear the electric fuel pump get the petrol up.

    On this 1990 car, I do not hear that noise and I am sure that it is fuel injected.

    Do any of you have experience with an electric fuel pump making some clicking noise on 1989 and 1990 Avanti's and what they need for a start after a long time sitting???

    Regards
    Greg Diffen
    Attached Files
    Greg Diffen

    Editor Studebaker Owners Club UK magazine

    Australian Stude guy living in Warwick, United Kingdom

    1933 St Regis Brougham Model 56 delivered new in the Netherlands
    1937 Dictator sedan Australian Body by TJ Richards RHC
    1937 Packard Super 8 Limousine UK delivered RHC
    1939 Packard Super 8 Seven Passenger sedan monster UK delivered RHC
    1939 Commander Cabriolet by Lagenthal of Switzerland
    1963 Lark Daytona Hardtop
    1988 Avanti Convertible

  • #2
    A fuel injected car of that vintage would usually have a rotary fuel pump submerged in the gas tank. It will not make the same ticking noise that the exterior fuel pump for carbureted car would make. You may hear a soft whirring noise, or it may be silent.

    A standard culprit is the pump itself, or the fuel pump relay; the device that turns the pump on.

    Do you have a shop manual or a wiring diagram for the Avanti?
    Last edited by RadioRoy; 11-02-2022, 07:39 PM.
    RadioRoy, specializing in AM/FM conversions with auxiliary inputs for iPod/satellite/CD player. In the old car radio business since 1985.


    10G-C1 - 51 Champion starlight coupe
    4H-K5 - 53 Commander starliner hardtop
    5H-D5 - 54 Commander Conestoga wagon

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    • #3
      Roy-
      No such thing as a shop manual for an Avanti II. There are some wiring diagrams floating around for the earlier cars, but in this case, a 1990 Chevy Caprice manual would come closest.
      Skip Lackie

      Comment


      • #4
        Thanks Skip. Would a 1990 Caprice have a fuel pump submerged inside the gas tank?

        The pumps I have experienced seem to fail around 70K - 100K miles. That's only a small sampling size, though.
        RadioRoy, specializing in AM/FM conversions with auxiliary inputs for iPod/satellite/CD player. In the old car radio business since 1985.


        10G-C1 - 51 Champion starlight coupe
        4H-K5 - 53 Commander starliner hardtop
        5H-D5 - 54 Commander Conestoga wagon

        Comment


        • #5
          Guys,
          thanks for the tip. I am sure the petrol tank has to come out for this to be checked as I am sure the pump is in the tank.

          I have a set of Chevy manuals for my 88 Avanti, so I am sure there never was a manual for the Avanti's.

          It's been sitting so long it probably needs to be checked, and I am sure a failed pump is the problem.
          I may check first by letting off the fuel line at the front of the car and trying that to spray fuel everywhere....

          Regards
          Greg
          Greg Diffen

          Editor Studebaker Owners Club UK magazine

          Australian Stude guy living in Warwick, United Kingdom

          1933 St Regis Brougham Model 56 delivered new in the Netherlands
          1937 Dictator sedan Australian Body by TJ Richards RHC
          1937 Packard Super 8 Limousine UK delivered RHC
          1939 Packard Super 8 Seven Passenger sedan monster UK delivered RHC
          1939 Commander Cabriolet by Lagenthal of Switzerland
          1963 Lark Daytona Hardtop
          1988 Avanti Convertible

          Comment


          • #6
            Originally posted by RadioRoy View Post
            Thanks Skip. Would a 1990 Caprice have a fuel pump submerged inside the gas tank?
            Yes. Throttle body injection on big Chevys beginning in 1989. (The 1988 models may have been the last carbureted American car.)
            Skip Lackie

            Comment


            • #7
              Originally posted by go-studebaker View Post
              Guys,
              thanks for the tip. I am sure the petrol tank has to come out for this to be checked as I am sure the pump is in the tank.

              I have a set of Chevy manuals for my 88 Avanti, so I am sure there never was a manual for the Avanti's.



              Regards
              Greg
              Greg-
              I have a mint-condition 1990 big Chevy shop manual you can have for the postage. I believe the 89 and 90 models are pretty much identical mechanically, so this should apply to your new purchase even if the mechanicals are really 1989.
              Skip Lackie

              Comment


              • #8
                Hi Skip,
                send me a personal message so I can email you.

                Regards
                Greg Diffen
                Greg Diffen

                Editor Studebaker Owners Club UK magazine

                Australian Stude guy living in Warwick, United Kingdom

                1933 St Regis Brougham Model 56 delivered new in the Netherlands
                1937 Dictator sedan Australian Body by TJ Richards RHC
                1937 Packard Super 8 Limousine UK delivered RHC
                1939 Packard Super 8 Seven Passenger sedan monster UK delivered RHC
                1939 Commander Cabriolet by Lagenthal of Switzerland
                1963 Lark Daytona Hardtop
                1988 Avanti Convertible

                Comment

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