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Fuel is Mixing with Oil in Crankcase
How did fuel get in my engine oil and how do I fix this?
If your engine has a fuel shut-off valve, ensure that this valve is closed when the engine is not in use. This condition may also be the result of the fuel float in the carburetor being stuck in the open position due to gumming (caused by stale fuel) or debris.
For assistance with your troubleshooting, please download our Carburetion Troubleshooting Quick Reference Guide (PDF).
Your Illustrated Parts List will provide component part numbers for carburetor rebuild kits or any other part specific to your engine's Model, Type and Code that may be required.
Your best source of information regarding any engine concern would be a Briggs & Stratton Authorized Dealer. Your Briggs & Stratton Authorized Dealer has all the information relating to Briggs & Stratton warranty information, replacement engines, short blocks, parts, pricing, service/repair, specifications, etc.
For your convenience, we offer three easy ways to locate your nearest Briggs & Stratton Authorized Dealers:
Use our website's Service Center Locator.
Visit www.yellowpages.com and enter "Lawn Mowers" or "Engines-Gasoline" in the Category search field and your Postal Code in the Location search field.
Call the Briggs & Stratton Automated Hotline at (800) 444-7774. This hotline is available 24 hours a day/7 days a week and features voice recognition technology to assist you in finding the Briggs & Stratton Authorized Dealers in your area. Automated maintenance tips, product information, and FAQs are also offered through voice activated menus.
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