12V Fuel Injector Tester & DIY Cleaning Tool – Test 2 at Once

Diagnose & Clean Fuel Injectors Like a Pro — Right in Your Driveway

Stop guessing and start diagnosing. The 12V Upgraded Fuel Injector Tester & DIY Cleaning Tool lets you quickly identify stuck, leaking, or worn-out fuel injectors without an expensive trip to the mechanic. One of its standout features: you can test two injectors simultaneously, saving you time on multi-cylinder engines. With four selectable pulse signal modes and a continuous working mode, this tool gives you full control over your injector diagnostics — all powered directly by your 12V car battery.

Includes 2 DIY cleaning heads so you can flush and clean injectors right at home (cleaning fluid sold separately).

Made in Mainland China.

Key Features

• Test Two Injectors at Once — Dual pulse output terminals let you check two injectors simultaneously for faster diagnostics.
• 4 Pulse Signal Output Modes — Single pulse, short pulse, long pulse, and continuous pulse modes to suit any testing scenario.
• 12V Battery Powered — Connects directly to your vehicle's battery; no external power source needed.
• Mode Lock Function — Ensures consistent, repeatable results when testing multiple injectors back-to-back.
• DIY Cleaning Ready — Comes with 2 cleaning heads so you can perform injector cleaning at home (cleaning oil not included).
• Compatible with Fuel Pressure Testers — Works seamlessly alongside any standard fuel pressure tester for comprehensive diagnostics.
• Signal Indicator Light — Illuminates during pulse output so you always know when the tool is actively testing.
• Identifies Stuck, Leaking & Dead Injectors — Pinpoints exactly which injectors are failing so you only replace what's needed.

Pulse Mode Guide

How to Use

1. Turn off the vehicle engine completely.
2. Disconnect the wire plug from the fuel injector(s) to be tested.
3. Connect the tester's two pulse output terminals to the fuel injector(s).
4. Attach the red clip to the positive (+) terminal of your 12V car battery, and the black clip to the negative (−) terminal.
5. Press "Mode Set" to choose your desired pulse mode (displayed on screen).
6. Press "Pulse" to begin testing — the signal indicator light will illuminate.
7. To retest, press "Pulse" again. To change modes, press "Reset" and re-select.
8. When finished, restore all vehicle connections to their original state.

Safety Warnings

• Always turn off the engine before use.
• Use only in well-ventilated areas — avoid inhaling fuel vapors or exhaust gas.
• Do not smoke or use open flames near the vehicle during testing.
• Avoid splashing fuel onto hot engine components.
• Do not short-circuit the battery terminals.
• Keep clear of rotating or moving engine parts.
• Wear approved safety goggles at all times.
• Follow all warnings in your vehicle's maintenance manual.

What's in the Box

• 1× 12V Fuel Injector Tester (choice of Black or Orange)
• 2× DIY Cleaning Heads
• Note: Batteries and cleaning fluid not included.

For more automotive safety tips and DIY vehicle maintenance guidance, visit the U.S. Consumer Product Safety Commission (CPSC).

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Frequently Asked Questions

Q: Can this fuel injector tester work on both gasoline and diesel vehicles?

A: This 12V fuel injector tester is primarily designed for gasoline (petrol) fuel injectors. It may work on certain diesel injector types, but we recommend checking your vehicle's injector specifications before use to ensure compatibility.

Q: Do I need to remove the injectors from the engine to test them?

A: No. You can test fuel injectors while they are still installed in the engine. Simply disconnect the injector's wire connector, connect the tester's pulse output terminals in its place, hook up to the 12V battery, and run your chosen pulse mode to diagnose the injector's condition.

Q: What cleaning fluid should I use with the DIY cleaning heads?

A: The cleaning fluid is not included and must be purchased separately. Use a fuel injector cleaning solution specifically formulated for automotive fuel injectors. Always handle cleaning fluids in a well-ventilated area and follow the cleaning fluid manufacturer's safety instructions.

Q: How do I know if a fuel injector has failed using this tester?

A: Connect the tester and select a pulse mode. A healthy injector will click audibly as it opens and closes. A stuck-open or stuck-closed injector may produce no click, a weak click, or visible fuel leakage during the test. The signal indicator light confirms the tester is sending pulse signals to the injector throughout the test cycle.