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Fuel Tank Sponge

What is the purpose of the sponge in the gas tank?

This "sponge" is used to prevent air pockets in the fuel. These air pockets are caused by equipment vibrations and can eventually lead to a condition called vaporlock. When the engine is vaporlocked, it will not be able to start.

Not all engines require the use of this sponge, and if your engine's fuel tank did not come equipped with one it cannot be added. If your engine does contain this sponge, it is very important that the fuel remain fresh. Stale fuel will cause the sponge to deteriorate and block fuel passages in the fuel system.

For your convenience, Do-It-Yourself parts and products such as Briggs & Stratton Advanced Formula Fuel Treatment & Stabilizer may be ordered through the Maintenance Parts section of our website.

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 Dealer Locator.

  • Visit 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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