Question about Craftsman 42" Briggs Stratton 20 hp Gas Powered Riding Lawn Tractor

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I have briggs and stratton powered mower with the 18.5 v-twin ohv intek engine modle 407777 type 0121-E5 CODE 000512ZYG MY PROBLEM IS THAT MY CRANKCASE IS FULL OFA GAS OIL MIXTURE THE OIL FILTER ALSO HAD GAS IN IT THE STARTER WILL NOT INGAGE ................**** HOWARD

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When the float in the carb sticks, it allows fuel to drain into the cylinder, that runs pass the rings into the crankcase. When the crankcase is full the pistons cannot go down, and the starter won't turn the engine. Drain all the oil gas mixture, and refill with proper oil. Replace float, needle and seat in the carb bowl. Throughly clean fuel passages, and bowl. If motor won't turn, remove spark plug and turn over engine a few times to remove gas oil mixture from the cylinder too.

Posted on Oct 03, 2010

  • ben moye
    ben moye Mar 23, 2014

    please send resulation so i can print

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This is a typical problem with older Briggs & Stratton carburetors. The easiest fix is to install a shutoff valve in the fuel line between the tank and the carburetor. This will stop the fuel overflow when not running. Then change the oil to remove any gas from crankcase.

Posted on Jan 31, 2015

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Posted on Jan 02, 2017

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