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    Re: Proper wiring for a rotax 503 (Ski doo I think)
    #11
    Senior Member Beruba's Avatar
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    Feb 2014
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    Gravity should work you might have a fuel pump that look like this.
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    Re: Proper wiring for a rotax 503 (Ski doo I think)
    #12
    Senior Member darwinpayne2000's Avatar
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    Jan 2010
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    American Fork, UT 90 minutes from the sand
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    The size of the fuel line probably won't be the determining factor. The float valve has a lot to do with it.

    I took a Mikuni carburetor off an engine that used a pulse pump and put it on an ATV that was gravity fed. It would run fine until I cracked the throttle wide open. After a few moments, it would be starving for fuel. Conversely, I took a Mikuni carburetor off an engine using a gravity feed and put it on an engine that had a pulse pump. I started having issues with flooding.

    I learned that the Mikuni carburetors have different apertures on the float valve, depending on the application. The carburetor that was used with a pulse pump had a 1.5 aperture, while the carburetor that was gravity fed had a 2.5 aperture. When I ordered and installed the correct float valve for each fuel setup, all my issues went away.

    Something to check while you're working on your engine.
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