STA-BIL Marine Fuel System Treatment, 32 oz — in-season cleaner and corrosion protection

STA-BIL 360 Marine Fuel System Treatment (32 oz) is an all-in-one in-season formula that cleans the entire marine fuel system, removes water and deposits, and helps protect internal parts from corrosion.

If you run a boat, personal watercraft, or any marine engine, fuel contamination and varnish build-up reduce power and reliability. STA-BIL 360 is formulated to work while your craft is in regular use: it targets deposits on injectors, carburetors, lines, and pumps, emulsifies small amounts of water, and leaves corrosion inhibitors behind to protect metal components during the season.

How does STA-BIL 360 improve engine responsiveness and fuel economy?

The formula contains fuel system detergents and PEA-based additives that break down gum, varnish, and carbon residues that restrict fuel flow. Cleaner fuel delivery means more consistent combustion, which can translate to smoother acceleration and better throttle response.

• Removes deposits from injectors and carburetors to restore spray patterns
• Reduces fuel flow restrictions for steadier engine performance
• Optimizes combustion for improved fuel efficiency under typical operating conditions

Will this product protect my fuel system from rust and corrosion during the season?

Yes — STA-BIL 360 deposits corrosion inhibitors on fuel system metal surfaces while cleaning, helping limit rust and oxidation when the boat is in use. It’s designed for in-season protection; for long-term storage you can pair it with a dedicated storage stabilizer.

• Forms a protective film on pumps, lines, and injectors
• Helps prevent rust-related damage during humid or salty conditions
• Compatible with routine in-season treatments to maintain protection

How do I use the 32 oz bottle — what’s the dosing and process?

Application is straightforward: add the product directly into the fuel tank before refueling. The recommended ratio treats fuel immediately and the engine should be run briefly so treated fuel circulates through the system.

• Use 1 oz per 10 gallons of fuel for standard treatment
• Pour into the tank prior to filling to ensure mixing
• Run the engine for about five minutes to allow full-system passage

Can it handle water contamination and be used alongside storage stabilizers?

STA-BIL 360 helps emulsify small amounts of water so contaminants can be burned off or separated, reducing the risk of fouled injectors and fuel pumps. For long-term storage, use STA-BIL Storage products in addition to in-season treatments for complete year-round care.

• Emulsifies minor water in the fuel for safe combustion or removal
• Works well with STA-BIL storage solutions for off-season protection
• Suitable for repeated in-season treatments to maintain clean fuel paths

Who is this for? STA-BIL 360 Marine Fuel System Treatment (32 oz) is aimed at boat and PWC owners, captains, and marina technicians who want to maintain reliable performance during the season without dismantling the fuel system. It’s ideal for those seeking an easy, preventive treatment that cleans deposits, helps manage small amounts of water, and provides corrosion protection while the craft is in regular use.