Fuel Injector Cleaner for 5 7 Hemi: 5 Top Picks Compared

If your 5.7 Hemi feels sluggish or you’ve noticed a dip in gas mileage, dirty fuel injectors might be the culprit. Over time, carbon deposits and varnish can clog these tiny nozzles, robbing your engine of power and efficiency.

This guide compares five top-rated fuel injector cleaners and cleaning tools specifically for the 5.7 Hemi. Whether you need a simple pour-in additive or a professional-grade cleaning kit, you’ll find the right solution to get your engine running smoothly again.

Royal Purple 18000 Fuel Injector Cleaner – Restore Power

Royal Purple’s 18000 Fuel Injector Cleaner is a concentrated 6-ounce formula designed to tackle deposits in your 5.7 Hemi’s fuel system. It works to restore lost fuel economy by cleaning injectors and stabilizing ethanol-blended fuels, which can degrade over time. Many Hemi owners notice improved throttle response and a return of peak horsepower after a single treatment. The additive is easy to use: just pour the entire bottle into your gas tank before filling up.

This cleaner is particularly effective if you primarily use your truck or SUV for daily driving and want to maintain consistent performance. It doesn’t just clean; it also helps prevent future buildup, keeping your injectors in good shape between oil changes. For a straightforward, no-fuss maintenance product that delivers on its promises, Royal Purple is a solid choice for any 5.7 Hemi owner looking to maximize engine responsiveness and fuel efficiency without complicated procedures.

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• Restores fuel economy
• Stabilizes ethanol
• Maximizes horsepower
• Improves responsiveness
• For use in both gasoline and diesel engines
• Fit type: Universal Fit

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STP Ultra 5 In 1 Fuel System Cleaner – Deep Clean

STP Ultra 5 in 1 Fuel System Cleaner is a 12-ounce treatment that goes beyond simple injector cleaning. It uses a blend of PEA and PIBA detergents to remove harmful deposits throughout the entire fuel system, including intake valves and combustion chambers. For your 5.7 Hemi, this means fighting engine friction while keeping the fuel intake system clean. The formula contains three times the cleaning agents found in leading premium gasoline, making it a potent option for engines that have seen some neglect.

Using it is straightforward: pour the entire bottle into your gas tank before refueling. Many Hemi drivers report smoother idling and better acceleration after treatment. This product is ideal if you want a comprehensive clean that addresses more than just injectors. It helps you save gas by maintaining a clean system, and the anti-friction properties can extend engine life. For a thorough fuel system overhaul in a single bottle, STP Ultra is a strong contender.

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• One 12 oz bottle of STP (R) Ultra 5 in 1 Fuel System Cleaner deep cleans entire fuel system
• Features a blend of PEA and PIBA detergents to help remove harmful deposits and fight engine friction in any gasoline engine
• 3x the amount of cleaning agents compared to the leading premium gasoline (1)
• STP (R) Ultra 5 in 1 Fuel System Cleaner helps you save gas by keeping your vehicle's fuel intake system clean
• Pour the entire bottle of fuel treatment into a vehicle gas tank that is at least half full
• Use STP (R) fuel additive every 4,000 miles for best vehicle performance
• Treat Rate: 12 FL. oz. bottle treats up to 35 gallons of gasoline

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YUANRI Universal Fuel Injector Tester Cleaner Kit – DIY Tool

The YUANRI Universal Fuel Injector Tester Cleaner Kit is a hands-on tool for those who prefer to clean injectors directly rather than using additives. It includes six sizes of cleaning adapters to fit most injector types, making it a versatile choice for your 5.7 Hemi. The unit offers eight pulse modes with selectable 12V or 5V power drive, allowing you to match the cleaning intensity to your injectors’ needs. Its 4-wire dual channel design lets you clean two injectors simultaneously, speeding up the job.

This kit is powered by a 12V battery or an external DC 12V supply (1.5A minimum). It’s ideal for DIY enthusiasts who want to perform professional-level cleaning at home. By using this tool, you can remove stubborn carbon deposits that additives might miss. The adjustable pulse modes help simulate real engine conditions, ensuring a thorough clean. If you’re comfortable with basic mechanical work and want full control over the cleaning process, this kit is a valuable addition to your garage.

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• 【6 Size Adapters Cleaning Tool & Universal Fit】 – Our fuel injector tester cleaner kit are available in 6 sizes of cleaner adapters and are widely used for all types of injectors from 5V-12V, such as EFI and GDI injectors. These include 5 types of adapters with hole diameters of 9.8mm, 10.8mm, 11.8mm, 12mm, 13.5mm, and one type of adapter with threaded holes specifically for BMW N-series injectors, such as N14/N18/N20/N26/N53/N54/N55/N63/S63.
• 【8 Pulse Modes & 12V/5V Power Drive】 – Our fuel injector cleaner kit can select High/Low(12V/5V) power drive and 4 pulse signal output modes, making a total of 8 Pulse Modes: Short/ Medium/ Long/ Continuous pulse modes + High/Low(12V/5V) power drive modes. This fuel injector tester has a wide variety of pulse modes, providing a large testing space to accurately and quickly diagnose and repair petrol vehicle injectors' fuel delivery problems.
• 【4-Wire Dual Channel for 2 Injectors】 – The fuel injector tester with 4-Wire Dual Channel design. Compared with other injector tester tool, our injector tester has an additional pair of test leads, which can test 2 injectors at the same time.
• 【Power Supply & NOTES】 – Our testers are powered by a 12V battery or external DC 12V (1.5A minimum) power adapter and can be used with any fuel pressure tester. NOTE: Gasoline car only, NOT the diesel engine!! A cleaner (not included) and a 12V DC battery power supply (not included) are required. Please prepare these necessary tools in advance.
• 【Polarity Reverse Connection Protection & Short Circuit Protection】 – Our fuel injector tester have power input reverse connection protection and output short circuit protection. You don't have to worry about damaging the automobile fuel injector cleaner because of a small careless mistake.
• 【Additional Function】 – (1. This Injector Tester Cleaning Kit can also be modified for relay testing or solenoid valve testing, other modifications should be made under professional guidance. (2. Our injector tester can be used with any fuel pressure gauge/tester with the engine off.
• 【3-Year Wa-rran-ty】 – Our technicians and customer support provide professional diagnostics and service. We promise a 3-Year wa-rran-ty and refunds or exchanges without worry.

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STA-BIL In-Season Protection Fuel System Treatment – All-Round Care

STA-BIL In-Season Protection Fuel System Treatment & Injector Cleaner is a 4-ounce formula that cleans and protects your 5.7 Hemi’s entire fuel system. It removes water, gum, and varnish from injectors, lines, and fuel pumps, ensuring optimal performance and longevity. Beyond cleaning, it offers industry-leading rust and corrosion protection for internal fuel system parts, which is especially valuable if you live in a humid area or store your vehicle seasonally. The treatment also boosts MPG by optimizing fuel performance, leading to better gas mileage and improved engine power.

Usage is simple: pour one 4-ounce bottle into your tank for every 5 gallons of fuel. This product is ideal for Hemi owners who want a maintenance cleaner that also provides long-term protection. It’s the same formula as the former 360 Protection, so you’re getting a trusted product with a new name. If you’re looking for a cleaner that does more than just remove deposits—offering corrosion protection and fuel stabilization—STA-BIL is an excellent choice for year-round care.

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• FUEL SYSTEM CLEANER: Cleanses the entire fuel system, including fuel injectors, lines, & fuel pumps, this formula removes water, gum, & varnish, ensuring optimal performance & longevity of your fuel system while preventing corrosion.
• CORROSION PROTECTION: Industry-leading rust and corrosion protection for all internal fuel system parts.
• MPG 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: New name, same formula as our 360* Protection. Pour directly into fuel tank prior to fill up. Use one 4 oz bottle for every 5 gallons of fuel.
• YEAR-ROUND PROTECTION: Pair STA-BIL In-Season Protection with STA-BIL Storage, providing a complete solution for both in-season operation & storage needs during the winter ensuring that your equipment remains in peak condition year-round.

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MR CARTOOL V308 Injector Cleaner Machine – Professional Grade

The MR CARTOOL V308 Injector Cleaner Machine is a professional-grade ultrasonic cleaner and tester for up to four injectors at once. It quickly removes carbon deposits from your 5.7 Hemi’s fuel system using heated cleaning fluid and ultrasonic waves. The machine features 11 main functions, including idle speed, medium speed, high speed, accelerating, and variable speed tests, allowing you to thoroughly evaluate injector performance. Its 2000ml large capacity ultrasonic tank can handle multiple injectors simultaneously, saving time on bigger jobs.

This unit comes with an LED display and pressure gauge for easy monitoring. It’s designed for gasoline engines and motorcycles, making it a versatile tool for any Hemi owner who works on multiple vehicles. The heated cleaning fluid enhances the ultrasonic action, breaking down tough deposits that standard cleaners can’t touch. If you’re a serious DIYer or a small shop owner, the V308 offers professional results without the shop price. It’s an investment in long-term engine health, ensuring your injectors perform at their best.

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• [ULTRASONIC INJECTOR CLEANER AND TESTER ] V308 can be used for cleaning and testing four injectors at the same time. Quickly remove carbon from your fuel system, testing leaking, uniformity, and inbreathes of injectors. Discharge fluid more quickly.
• [11 MAIN FUNCTIONS] V308 injector cleaner machine has 11 Main Functions: Ultrasonic Cleaning; ldle Speed Test; Medium Speed Test; High Speed Test; Accelerating Test; Variable Speed Test; Leakage Test; ldle Spray Volume; Medium Spray Volume; High Spray Volume; Unit Info.
• [ULTRASONIC CLEANING&HEATED CLEANING FLUID] The V308 Injector Cleaning Tester has a 2000ml large capacity ultrasonic cleaning tank, which can clean multiple injectors at the same time, removing carbon deposits on the injectors thoroughly.The V308 has a heating function, which can heat the cleaning heat up to 45 degrees Celsius by pressing the switch on the side of the machine, removing carbon deposits on the injectors effectively.
• [HUMANIZED DESIGN] V308 fuel injector cleaner kit equipped with an LED display, pressure gauge, glass tubes, testing liquid level gauge, and multifunctional control panel, their combination allows you to easily operate through the clear menu, and monitor the fuel injector detection and fuel dynamic value in real-time.
• [LOW-PRESSURE GASOLINE INJECTOR TESTING] The V308 is compatible with every engine in your garage. It includes adapters for Φ9.8mm, 10.5–13.5mm, 10.6mm, 11mm, and 12.5–14.5mm, allowing you to clean and test low-pressure port fuel injectors for a wide range of vehicles—including cars, motorcycles, boats, and more. *NOTE: Ultrasonic Cleaning Function supports almost all gasoline and diesel fuel injectors. Fuel Injector Testing Function is only compatible with gasoline injectors.
• [Worry-Free After-Sales] MRCARTOOL offers a 3-year warranty on the product main unit, effective from the date of delivery. Should you encounter any issues, please do not hesitate to reach out to our support team, and we will strive to resolve them promptly.

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Buyer’s Guide: What to Consider

Choosing the right fuel injector cleaner for your 5.7 Hemi depends on your needs. Consider these factors to make an informed decision.

• Compatibility with 5.7 Hemi: Ensure the cleaner or tool is safe for your engine's fuel system. Most pour-in additives work, but check if the tool's adapters fit Hemi injectors.
• Type of Cleaner: Choose between pour-in additives for easy maintenance or ultrasonic/test tools for deep cleaning. Additives are simpler; tools offer more control.
• Cleaning Agents: Look for PEA (polyether amine) or PIBA detergents in additives. PEA is more effective at removing carbon deposits from injectors and intake valves.
• Ease of Use: Pour-in cleaners require no mechanical skill. Tool kits need basic knowledge of fuel systems and access to a power source or battery.
• Frequency of Use: For maintenance, use a pour-in cleaner every 3,000-5,000 miles. Tools are for periodic deep cleaning or when you notice performance issues.

Conclusion

Keeping your 5.7 Hemi’s fuel injectors clean is key to maintaining power and fuel economy. Whether you prefer a simple additive like Royal Purple or STP, or a hands-on tool like the YUANRI or MR CARTOOL, there’s an option for every skill level.

For most drivers, a pour-in cleaner offers the best balance of convenience and effectiveness. If you’re a DIY enthusiast, investing in a cleaning tool can save money over time and give you professional results at home.