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    oldschooldad's Avatar
    oldschooldad Posts: 1, Reputation: 1
    New Member
    		  
    #1

    May 4, 2008, 09:28 AM
    18.5 hp Briggs and Straton
    I have a lawn mower with an 18.5 thatstarts but blows gas up through the carb. It runs but not good.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    May 4, 2008, 10:25 AM
    I think you may have an intake valve that's not totally closing. Can you do a compression testr and come back with some numbers?
    MOWERMAN2468's Avatar
    MOWERMAN2468 Posts: 3,214, Reputation: 243
    Ultra Member
    		  
    #3

    May 5, 2008, 10:17 AM
    Valves out of adjustment, or carb needs cleaning or adjusting.
    tarrbaby's Avatar
    tarrbaby Posts: 2, Reputation: 1
    New Member
    		  
    #4

    Jul 6, 2009, 01:55 PM

    Had same problem install in line fuel cut off close valve run carb dry,, then open valve and restart, close valve when not in use
    krazziee's Avatar
    krazziee Posts: 15, Reputation: 1
    New Member
    		  
    #5

    Jul 6, 2009, 06:05 PM

    I am going with the intake valve open, it is stuck open or it has burned itself or the head
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