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1989 OMC cobra 5.0 spitting fuel from carb

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  • 1989 OMC cobra 5.0 spitting fuel from carb

    Starting it for the first time since winterized, fuel spit out the top of the carb. I’ve rebuilt the carb, checked all cylinders for spark etc. it seems to do it on the revolution of the motor. My next option would be fuel pump but I’m kinda at a loss right now.

  • #2
    Is there fuel in the rubber hose from the pump that goes to the carb? (Assuming you still have a mechanical pump)
    '47 18' CC Utility "Knock On Wood"
    Various Evinrude powered Pontoons all named "Floosy"


    • #3
      my guess either the clear line from the fuel pump is full of fuel, or the float is stuck open
      Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

      1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

      Past Boats
      1970 Wooster Hellion - Merc 9.8
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      1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

      What’s behind you doesn’t matter.Enzo Ferrari


      • #4
        It is mechanical and there in no fuel
        in the rubber hose


        • #5
          Rebuilt the carb last night so I know everything is setup correctly inside the carb. I will take a closer look at the clear line from the pump to the carb tonight.


          • #6
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            If there is fuel in the yellowish/clear line the fuel pump diaphragm is likely bad.
            1988 Four Winns 200 Horizon
            4.3 OMC Cobra

            98 Jeep Grand Cherokee 4.0 Selectrac
            07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

            "While air doesn't freeze....rust never sleeps"