I CHANGE OIL&FILTER;,CLEAN VENT WHAT ELSE COULD IT BE?
you have a blown head gasket,also valves should be replaced,complete head assembly with gasket approx. 110.00.had the same thing on 18.5 hp briggs and could'nt find any help so I bought a new engine.then took the old one apart everything else was fine.
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i had a ridin' mower do that. one of the valves was stuck.
something is leaking pressure from the engine into the casing where the oil sits - that pressure has to go somewhere, and its out the dip stick. Stuck valve, cracked casing, a few possibilities.
my exhaust valve was stuck partially closed and it allowed some of the exhaust to be forced into the crank case. i let the motor run and squirted a little tranny fluid into the carb. LOTS of smoke then the valve came unstuck.
righto - it was more a reply to the op, but you conveniently supported it :D
sounds like our guest just needs to overhaul the engine :D
Have you filled with the correct amount of oil?
Like others have suggested, I'd guess broken piston-rings.
However I don't understand the "FUEL PUMP" reference - it doesn't have one - what are you referring to?
. Sounds like bad rings or a scored cylinder wall to me.