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  1. #1

    Default Fuel line issue?

    Just purchased a pontoon boat with a mercury 50 hp 2 stroke engine. Boat wasn't run much so I had the carbs cleaned, fuel filter and spark plugs changed. Ran great for for a couple days but now the engine won't get higher than about 2700 rpm. Actually cut off on me several times. Only way to get back was to pump the primer but still it was low rpms. Engine will rev high in neutral but not in gear. Any ideas? Thanks!

  2. #2
    Join Date
    May 2007
    Inverary, Ontario, Canada - The Great White North Eh!

    Default Re: Fuel line issue?

    When you pump the bulb you are acting as the fuel pump.

    Now, it could be that the tank vent is blocked and the fuel pump just didn't have enough "suck" (and your pumping the bulb forced some gas up) OR your fuel pump might be on it's last legs.

    If you have a built in tank you will have to search for the vent and then try and see if it's clogged.

    If you are running on a portable tank you can 1) make sure the vent cap is open or 2) totally remove the cap and try running to see it that works (just making sure the tank can breathe).

    There also could be a clog in fuel line between the tank and the motor, at any of the connectors or in the fuel filter(s) if present - again, pumping the bulb may be forcing enough gas past a clog to allow it to run.

    If the tank/vent is "ok" and nothing else appears to be clogged, then you need to have your fuel pump inspected and possibly rebuilt.

    A "professional" is someone who gets paid for their work - it doesn't necessarily mean they are good at it :)

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