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Fuel line priming bulb

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  • Fuel line priming bulb

    I have a Mariner 115 two-stoke (1983) with a 13 gallon fixed tank. I had a cracked primer bulb that would not stay all the way hard. I replaced the fuel line and primer bulb with a Moeller replacement. The bulb is still not filling to the rock hard feel I remember. Should the bulb be hard or does it really matter? I have not had the boat in the water yet, but It starts up and runs fine in the driveway with no real "load" on the motor. Any ideas? -Thanks

  • #2
    Re: Fuel line priming bulb

    The bulb should pump up firm with the engine off. Try holding the bulb vertically rather than horizontally. Once the engine starts, the bulb does not stay firm because fuel is being sucked through it. There is no pressure in the system at that point.

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    • #3
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      Re: Fuel line priming bulb

      Originally posted by Silvertip View Post
      The bulb should pump up firm with the engine off. Try holding the bulb vertically rather than horizontally. Once the engine starts, the bulb does not stay firm because fuel is being sucked through it. There is no pressure in the system at that point.
      I'll give that a try, thanks a lot!

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