Posted by t.r.k. on February 23, 2019 at 17:10:19 from (71.31.64.233):
In Reply to: Gasoline in the oil? posted by 550Doug on February 23, 2019 at 06:42:08:
If it happens while the unit is sitting, most likely its from the needle valve in the carburetor leaking. fuel flows into the intake, past the valves, into the cylinder where it works past the piston rings and into the engine crankcase, where it mixes with the oil. We see lots of cases of this happening every year at the shop where I work.
The other senario is a leaking fuel pump diaphragm. both mechanical and pulse type fuel pumps with leaky diaphragms can permit fuel to flow into the engine crankcase. This can happen while the engine runs too, as well as when it is stored.
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