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    B.O. Irwin's Avatar
    B.O. Irwin Posts: 1, Reputation: 1
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    #1

    Jul 19, 2011, 11:38 AM
    Small engine carburetor substitution
    Hi, What is the difference in a gravity feed carburetor & a pump feed carburetor on a briggs & stratton riding lawn mower engine? Can they be interchanged? I have a Nikki #796109 (gravity feed) on my mower & want to replace it with a Nikki #794572 (pump feed). Briggs & Stratton engine number is 31P7770299E1.
    Thanks
    B.O. Irwin
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Jul 19, 2011, 01:06 PM
    Probably not if the pump feed is run off the engine.. It has a diaphragm to pressurize the fueel to the carb and runs off the cam or other eccentric. In a gravity feed, it is only the head pressure of the gas in the tank which is always above the engine. Model T and A Fords had gravity tanks, no fuel pump.
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