STA-BIL Marine Fuel System Treatment 32 oz – Cleans Injectors, Removes Water & Corrosion

STA-BIL 360 Marine Fuel System Treatment is a concentrated 32 oz formula that cleans the full fuel system, removes water and deposits, and helps protect against corrosion while improving fuel performance for boats and personal watercraft.

Designed for in-season marine use, this treatment targets fuel injectors, lines, pumps and the combustion pathway to remove gum, varnish and free water that compromise performance. The specially blended PEA (polyether amine) additives lift deposits while corrosion inhibitors guard internal metal surfaces. Use it before refueling and run the engine briefly to circulate the product through the system.

How does STA-BIL 360 improve my boat’s running condition?

The formula breaks down carbon, varnish and sticky deposits that form in injectors and valves, allowing more consistent fuel flow and combustion. Cleaning these parts reduces stumbling, rough idling and hesitation while helping the engine breathe and perform as intended.

• Removes gum and varnish from injectors and intake components
• Restores smoother idling and steadier throttle response
• Helps maintain consistent fuel atomization for better combustion

What protection does it offer against rust and water damage?

STA-BIL 360 contains corrosion inhibitors that coat metal surfaces to slow oxidation and minimize pitting inside tanks and lines. Its water-treating properties help separate and disperse free water, making it easier for the system to deal with small amounts of water contamination.

• Industry-grade rust inhibitors protect pumps, tanks and fittings
• Disperses small volumes of free water to reduce corrosion risk
• Suitable for in-season protection when craft may sit idle

How do I use the 32 oz bottle and what dosage is recommended?

Pour the liquid directly into the fuel tank before you add fuel. The recommended dosing is 1 ounce of STA-BIL 360 per 10 gallons of gasoline; after adding, run the engine for about five minutes to move the treatment throughout the fuel system.

• Use 1 oz per 10 gallons of fuel for routine treatment
• Pour before refueling to ensure proper mixing with fresh gasoline
• Run engine ~5 minutes to circulate through injectors, lines and pump

Can I use this with storage treatments or year-round products?

Yes — STA-BIL 360 is formulated for in-season cleaning and protection. For long-term off-season fuel stabilization, pair it with STA-BIL Storage products to preserve fuel during winter layup and provide comprehensive year-round care.

• Use STA-BIL 360 for active-season cleaning and corrosion protection
• Combine with STA-BIL Storage products for winter stabilization
• Creates a two-step maintenance routine for peak performance year-round

Who is this for? Boaters and watercraft owners wanting a single treatment to clean deposits, reduce small water contamination issues, and protect internal fuel system parts during the season will benefit most from STA-BIL 360. It’s suited to outboards, inboards and personal watercraft where maintaining fuel system cleanliness and corrosion protection improves reliability and performance between maintenance intervals.