Small Engines (Lawn Mowers, etc.)/toro push mower

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Question
how to remedy gasoline in oil resevoir

Answer
BOB

The engine is flooding or the spark plug is fouled and not burning all the fuel, allowing the excess gas to seep into the oil reservoir via the piston cylinder. Cleaning or changing the spark plug and doing a carburetor adjustment will help. Difficult to diagnose here in this text only type forum. However, you have described it very well.

Regarding the fuel getting into the oil, is there a fuel pump? If so, be sure it is turning off when the ignition is turned off. May also have a vacuum operated fuel shutoff valve.

If the carb is a diaphragm pump type, it may have a fuel return line. A restriction in this line could cause fuel pressure to build up, then dump into the engine after shutdown. The return line may be all or part of the problem.

If the fuel is gravity feed, the carb may appear to have a good needle and seat, yet it may not be closing fully. It's also possible the needle and or seat are damage or blocked do to debris in the carbs fuel bowl.

Also inspect the breather vent. Be sure it too is clear and operating correctly.

I have covered several items and fuel delivery systems that may not apply to your specific machine for the benefit of others whom also may read this posting.  

Small Engines (Lawn Mowers, etc.)

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BEN

Expertise

I will answer most questions related to this field of small engine repairs,servicing them and trouble shooting problem.Can not answer questions with out the proper Engine Model#,Spec # and Manufacture.

Experience

Presently own a small engine repair shop and a Electrical contracting business.I have been in this field for 26 years.

Education/Credentials
Kohler,Briggs & Stratton,Tecumseh,MTD,Honda,and other Dealer Schools

Awards and Honors
HONORABLE DISCHARGE FROM THE UNITED STATES NAVY VIET NAM SERVICE MEDAL,GOOD CONDUCT AWARD EXPERT MARKSMANSHIP AWARD

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