1989 Mercury Fuel Delivery Problems

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  • August 12, 2015 at 12:15 pm #2249
    newness63
    Participant

      Hi. Is there a check valve in the primer bulb ? or elsewhere? My 40 HP loses prime

      August 12, 2015 at 1:36 pm #21966
      Michael Anfossi
      Participant

        International Member

        Yes the primer should have a check valve. Remove hose from engine end of primer. Squeeze primer then block open end with finger. If primer does not stay flat, check valve not working. Replace primer

        August 12, 2015 at 3:21 pm #21971
        newness63
        Participant

          Ok Thanks I have to pump the bulb every time to start the motor!

          August 12, 2015 at 5:22 pm #21975
          jw-in-dixie
          Participant

            Also check the hose for a hairline crack – one that will let air in so that the fuel drains back to the tank. Doesn’t have to leak fuel, just air. Been there and had that to happen.

            JW in Dixie

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