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Gas in crankcase

P

pitter

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my daughter has a 60hp bigfoot

my daughter has a 60hp bigfoot four stroke. last time out it started running real rough and quit. after a rest restarted and struggled back in. i checked it out and found she had about 1 1/2 quarts of gas in the crankcase mixed in with the oil. how in the world did the gas get in there??
 
i replaced the fuel pump about

i replaced the fuel pump about 7or 8 months ago. how could it pump into the crankcase??
 
"A cracked/broken/pin hole in

"A cracked/broken/pin hole in the fuel pump diaphram (the pump is driven by crankcase pressure/vacuum) - if there is a problem with the diaphram (or a gasket for that matter) when the piston, for whatever cylinder is driving the fuel pump, is on the up stroke, gas is sucked through the (leak) into the crankcase..."
 
that sounds reasonable to me a

that sounds reasonable to me and i thank you and i will check it out; and again i thank you..
 
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