Marine Fuel Injector Cleaner: 5 Top Picks Compared

If your boat’s engine is running rough, idling poorly, or guzzling fuel, a marine fuel injector cleaner could be the simple fix you need. These treatments remove carbon deposits, clean injectors and carburetors, and even eliminate water from your fuel system.

This guide compares five top-rated products to help you choose the right one for your outboard, inboard, or stern drive. We break down each formula’s key features so you can get back on the water with confidence.

STA-BIL Marine Tune-Up – Cleans & Fixes Rough Running

STA-BIL Marine Tune-Up is a versatile fuel treatment designed to clean carburetors and fuel injectors while also eliminating water from your fuel system. This 8-ounce bottle treats up to 20 gallons of fuel, making it a practical choice for smaller tanks or quick maintenance. If your engine has been sitting or running roughly, this formula works to restore smooth operation by dissolving gum and varnish deposits.

You’ll appreciate that it not only cleans but also fixes common running issues without requiring a mechanic. The blue liquid is easy to pour, and the treatment is compatible with both gasoline and ethanol-blended fuels. For a straightforward, all-in-one solution that tackles multiple problems, this STA-BIL product is a solid option for weekend boaters.

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• Great Product

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Quicksilver Quickleen – Thorough Carbon Deposit Remover

Quicksilver Quickleen is a gas treatment and injector cleaner formulated to work with all grades of gasoline, including ethanol blends. It quickly removes carbon deposits from carburetors, injectors, intake valves, spark plugs, piston crowns, and cylinder heads. This thorough cleaning helps prevent engine knocking and piston seize-up, which can be critical for high-performance marine engines.

You can use it at every fuel tank fill-up, with just 1 ounce treating 5 gallons of gasoline. The 12-ounce bottle provides multiple treatments, making it economical for regular maintenance. If you want to keep your engine running smoothly and avoid costly repairs, this Quicksilver product offers a proven solution that targets the entire combustion chamber.

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• Gas treatment and injector cleaner for use with all grades of gasoline and ethanol-blend fuel
• Quickly and thoroughly removes carbon deposits from carburetors, injectors, intake valves, spark plugs, piston crowns and cylinder heads
• Prevents engine knocking and piston seize-up
• Can be used at every fuel tank fill-up — 1 ounce treats 5 gallons of gasoline
• Manufacturer part number 8M0047921

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STAR BRITE Star Tron Enzyme – Ethanol Problem Solver

STAR BRITE Star Tron Enzyme Fuel Treatment uses enzyme technology to help engines start more reliably and run cleaner, even after periods of inactivity. It prevents and cures most ethanol-related issues, such as poor performance, rough idling, and decreased fuel economy. The concentrated 32-ounce bottle treats up to 512 gallons, offering exceptional value for larger fuel tanks or multiple engines.

By removing and preventing gum, carbon deposits, and varnish build-up, Star Tron keeps your fuel delivery system clean, resulting in improved fuel economy. It works for all engines and fuel types, including cars, boats, RVs, and lawn mowers. If you struggle with ethanol-related problems or store your boat for extended periods, this enzyme-based formula provides peace of mind and reliable performance.

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• ENZYME TECHNOLOGY – Uses enzyme technology designed to help engines start more reliably and run cleaner, even after periods of inactivity.
• SAY GOODBYE TO ETHANOL-RELATED PROBLEMS – Prevents and cures most ethanol-related issues, including poor performance, rough idling, and decreased fuel economy, giving you peace of mind on the road or on the water.
• MAXIMIZE FUEL ECONOMY – By removing and preventing gum, carbon deposits, and varnish build-up, Star Tron keeps your fuel delivery system clean, resulting in improved fuel economy.
• WORKS FOR ALL ENGINES AND FUEL TYPES – Whether you have a car, boat, RV, or lawn mower, Star Tron works in all engines and all fuels, making it the ideal fuel treatment and stabilizer for any vehicle.
• PREVENT WATER BUILD-UP – Helps prevent phase separation by dispersing water throughout fuel as submicron-sized droplets that are safely eliminated while the engine operates, keeping your engine running smoothly in humid or wet conditions.
• REVITALIZE OLD FUEL – Stabilizes fuel up to 2 years and can help rejuvenate old, sub-spec fuel.
• SUPPORTS FUEL SYSTEM CLEANLINESS – Helps maintain fuel system cleanliness to support efficient engine operation and may contribute to improved fuel economy.
• COST-EFFECTIVE SOLUTION – At just one fluid ounce per sixteen gallons of fuel, Star Tron Fuel Treatment Formula 930 is an incredibly cost-effective solution for optimizing engine performance and efficiency.
• WIDELY USED GASOLINE TREATMENT – A widely used gasoline treatment formulated to help prevent ethanol-related fuel issues and support engine performance.

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STAR BRITE Star Tron PEA – Advanced Injector Cleaner

STAR BRITE Star Tron Fuel System and Injector Cleaner combines a proprietary blend of enzymes with advanced Polyetheramine (PEA) technology to clean fuel injectors, carburetors, and intake valves. This 4-ounce formula restores engine power by removing performance-robbing deposits, ensuring smoother operation and increased efficiency. The PEA technology dissolves the toughest carbon build-up, providing a superior clean that standard additives can’t match.

You’ll also benefit from enzyme rejuvenation, which breathes new life into old, stale fuel by breaking down unwanted deposits. This helps maximize fuel economy and reduce gas costs, making it an essential addition to your maintenance routine. For a targeted, high-performance cleaner that tackles stubborn deposits, this Star Tron product delivers noticeable results in a small, easy-to-use bottle.

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• RESTORE ENGINE POWER – Removes performance-robbing deposits with a proprietary blend of enzymes and cleaners, ensuring smoother operation and increased efficiency
• MAXIMIZE FUEL ECONOMY – Cleans fuel system components to help reduce fuel consumption and save on gas costs, making it an essential addition to your maintenance routine
• ADVANCED PEA TECHNOLOGY – Uses Polyetheramine (PEA) technology to clean fuel injectors, carburetors, and intake valves, offering a superior clean that dissolves the toughest carbon deposits
• ENZYME REJUVENATION – The enzyme formula breathes new life into old, stale fuel, breaking down unwanted deposits and restoring combustion efficiency for smoother starts and operation
• EASY TO USE SOLUTION – Simply add to your fuel tank and let the engine run, a hassle-free way to maintain engine health and performance without professional help
• VERSATILE APPLICATION – Designed for use on all engine types, including cars, trucks, and boats, ensuring peak performance across a wide range of vehicles
• LONG-LASTING EFFECTS – One treatment treats up to 40 gallons, offering a cost-effective solution for maintaining your engine’s performance over time
• RECOMMENDED MAINTENANCE – Use every 4 to 5 tanks or as needed, with Star Tron Enzyme Fuel Treatment at every fill-up for optimal results and continuous protection
• PEAK PERFORMANCE GUARANTEE – Designed to work with the latest engine technology, it keeps your engine running like new, minimizing the need for costly repairs and downtime
• SUPERIOR PERFORMANCE – With STAR BRITE, you're choosing a leading name in marine, auto, RV, home, and outdoor products since 1973, made for superior quality and performance

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STA-BIL 360 Marine – Corrosion Protection & Cleaner

STA-BIL 360 Marine Ethanol Treatment and Fuel Stabilizer cleanses the entire fuel system using PEA additives, including fuel injectors, lines, and fuel pumps. This advanced formula removes water, gum, and varnish while providing industry-leading rust and corrosion protection for internal fuel system parts. Designed for in-season cleaning, it helps optimize fuel performance, contributing to enhanced gas mileage and improved engine power.

Simply pour 1 ounce for every 10 gallons of fuel into the tank before filling up, then run the engine for 5 minutes. The 8-ounce bottle treats up to 80 gallons, making it a practical choice for most boat owners. If you want a product that both cleans and protects against corrosion, this STA-BIL formula is a comprehensive solution for maintaining your marine engine’s health.

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• FUEL SYSTEM CLEANER: Cleanses the entire fuel system using PEA additives, including fuel injectors, lines, & fuel pumps. This advanced formula removes water, gum, and varnish, ensuring optimal performance & longevity of your fuel system while preventing corrosion.
• CORROSION PROTECTION: Industry-leading rust and corrosion protection & designed for in-season cleaning & the protection of internal fuel system parts.
• PERFORMANCE BOOSTER: Designed to optimize fuel performance which contributes to enhanced gas mileage & improved engine power. This advanced formula cleans & protects the fuel system, allowing for efficient combustion & prolonged engine life.
• DIRECTIONS: Pour directly into fuel tank prior to fill up. Use 1 oz for every 10 gallons of fuel. Run the engine for 5 minutes to treat the entire fuel system.
• YEAR-ROUND PROTECTION: Pair STA-BIL In-Season Marine Protection with STA-BIL Storage, providing a complete solution for both in-season operation & storage needs during the winter ensuring that your watercrafts remains in peak condition year-round.
• FUEL STABILIZER: Stabilizes fuel in-season when watercraft is idle. For specific storage needs, use our STA-BIL storage fuel stabilizer product.

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Buyer’s Guide: What to Consider

Choosing the right marine fuel injector cleaner depends on your engine type, fuel system, and maintenance habits. Consider these key factors to find the best match for your boat.

• Fuel Type Compatibility: Ensure the cleaner works with your fuel, whether regular gasoline, ethanol blends, or diesel. Most marine formulas are designed for gasoline.
• Treatment Capacity: Check how many gallons each bottle treats. Concentrated formulas offer better value for large tanks, while smaller bottles suit occasional use.
• Cleaning Technology: Look for PEA (Polyetheramine) or enzyme-based cleaners. PEA is strong against carbon deposits; enzymes help with ethanol issues and stale fuel.
• Additional Benefits: Some products also remove water, prevent corrosion, or stabilize fuel. Choose one that addresses your specific engine problems beyond just cleaning.
• Application Frequency: Decide if you want a one-time treatment or a product you can add at every fill-up. Regular use helps maintain performance and prevent build-up.

Conclusion

Each of these five marine fuel injector cleaners offers unique benefits, from enzyme technology that tackles ethanol issues to PEA formulas that dissolve tough carbon deposits. Whether you need a quick fix for rough running or ongoing protection against corrosion, there’s a product here for you.

For most boaters, the STAR BRITE Star Tron PEA cleaner provides a powerful balance of cleaning and engine restoration, while the STA-BIL 360 Marine adds valuable corrosion protection. Choose based on your specific needs and enjoy smoother, more reliable performance on the water.