I have a sit on lawnmower and am having problems with the petrol getting into the oil sump.
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This can seriously damage the mower engine and turn out to be quite expensive.
Completely drain the oil tank using the drain plug and allow the oil tank to air out and dry overnight. Do this outdoors.
If you have a Briggs one cylinder engine, then the problem is probably in the carburetor. It has a solenoid in the bowl which shuts off the flow of gas when the ignition is switched off. The design is faulty - the solenoid does not completely shut off the gas and so it allows a siphon action to empty the bowl into the intake manifold. The raw gas then leaks down the cylinder wall and into the crankcase. Contact a repair shop. They will install installed a manual cut-off valve in the fuel line. You have to remember to open the valve before you start the engine and close it when you shut the engine off.
On a 4-stroke it could happen, gasoline is running down the cylinder walls if mixture is way to rich.
If it is a 2-stroke, gas and oil will be mixed before entering the cylinder. Check if there's a broken valve or something, so that gas can run down the oil line, if the engine is off.
Fill the oil tank with new oil. If needed, drain the oil tank again to ensure all of the gas is out of the oil tank before adding new oil again.
Seasonal storage is usually the culprit. You should run the engine dry and then add a non-ethanol fuel, then just run it dry one more time.
Lawn mowers with key left on overnight well sometimes leak gasoline into the engine cylinder and it'll slowly fill the engine oil case as the gasoline slips past the rings of the engine.
There could be an issue with the fuel line.
Briggs/Stratton website may give some insight for the problem:
www.briggsandstratton.com/
This is probably a problem that a lawn mower repair shop person will have to answer as there are several steps to finding the problem and they will most likely need to know more about your mower:
Try asking for help on one of these sites; you will have to join the group.
www.houzz.com/
www.lawnmowerforum.com/
www.gardentractortalk.com/
You might also find help on Google:
www.google.com/
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