1. Introduction
The BELEY FCM-4C is an automotive ultrasonic fuel injector cleaner and tester designed for cleaning and testing fuel injectors in cars and motorcycles. This machine supports simultaneous cleaning and testing of up to four injectors. It effectively removes carbon deposits from the fuel system and performs various tests including leakage, uniformity, and spray volume analysis. The unit operates on 220V power and features a user-friendly design with an LED display, pressure gauge, glass tubes for observation, and a multifunctional control panel.
Important Safety Information:
- Read the operating instructions thoroughly before attempting to operate the unit.
- Keep this manual with the unit at all times for future reference.
- Do not operate equipment with a damaged cord or if the equipment has been dropped or damaged until it has been examined by qualified service personnel.
- If an extension cord is needed, use a cord with a rated current equal to or greater than that of the equipment.
- Test fluid is used by the main unit. The ultrasonic cleaning uses a specified ultrasonic detergent.
2. Package Contents
Verify that all items listed below are included in your package:
- 1pc Cleaner Machine Main Unit
- 4pcs Reverse Flush Connectors
- 4pcs Cone Connectors
- 1pc Funnel
- 1pc Cleaning Bracket
- 1pc Drain Valve
- 2pcs Fixing Bolts and Nuts
- 3pcs Oil Separator Plugs
- 4pcs Sealing Rings
- 1pc Cleaning Cover
- 4pcs Adapter Cables
- 1pc Power Cable
- 1pc Oil Separator
- 1pc User Manual

Image: All components included in the BELEY FCM-4C Fuel Injector Cleaner and Tester kit.
3. Product Overview
The BELEY FCM-4C features a robust design for efficient fuel injector maintenance. Key components include:
- Pressure Gauge: Monitors system pressure.
- Lock Pole: Secures the injector rail.
- Oil Outlet Pipe: Connects to the injector rail.
- Top Oil Inlet Connector: For various injector types.
- Glass Measuring Cylinder: For observing spray patterns and volumes.
- Oil Drain Handle: For draining test fluid.
- Operation Panel: LED display and control buttons for various functions.
- Pressure Regulating Knob: Adjusts system pressure.
- Ultrasonic Switch: Activates the ultrasonic cleaning function.
- Heating Switch: Activates the heating function for the ultrasonic tank.
- Power Switch and Socket: For main power control.
- Cleaning Agent Drain Valve: For draining cleaning fluid from the ultrasonic tank.
- Testing Agent Drain Valve: For draining testing fluid from the measuring cylinders.
- Ultrasonic Cleaning Tank: For ultrasonic cleaning of injectors.
- Testing Agent Liquid Level: Visual indicator for the test fluid level.

Image: Detailed diagram of the BELEY FCM-4C unit with numbered components.
4. Setup Instructions
- Unpacking: Carefully remove all components from the packaging. Inspect for any damage.
- Placement: Place the main unit on a stable, level surface in a well-ventilated area.
- Power Connection: Connect the power cable to the unit's power socket and then to a 220V power outlet. Ensure the power switch is in the OFF position before connecting.
- Fluid Preparation:
- Ultrasonic Cleaning Fluid: Pour a cleaning agent specifically designed for automotive engine carbon deposits into the ultrasonic cleaning tank. Do not overfill.
- Testing Fluid: Pour a specialized fuel injector testing fluid into the main reservoir. If unavailable, medical alcohol with a concentration of 75% or higher can be used, but it is not the optimal solution. Use the provided funnel to prevent spills. Observe the testing agent liquid level indicator on the side of the unit.
- Injector Installation for Cleaning:
- Connect the injector adapter cables to the injectors.
- Place the injectors into the cleaning bracket within the ultrasonic cleaning tank. Ensure the injectors are submerged in the cleaning fluid.
- Injector Installation for Testing:
- Attach the appropriate top oil inlet connectors to the injectors.
- Secure the injectors onto the oil rail.
- Mount the oil rail assembly onto the main unit, ensuring the injectors are positioned above the glass measuring cylinders.
- Connect the signal wires from the main unit to each injector.
- Connect the oil outlet pipe from the main unit to the oil rail.

Image: Front view of the unit, showing the control panel and measuring cylinders.

Image: Rear view of the unit, highlighting the drain valves and power socket.
5. Operating Instructions
The BELEY FCM-4C offers 11 main functions for comprehensive injector cleaning and testing. The control panel allows selection of functions and adjustment of parameters.

Image: Control panel with function indicators and display.
5.1. Ultrasonic Cleaning
- Ensure injectors are installed in the ultrasonic cleaning tank and submerged in cleaning fluid.
- Turn on the main power switch.
- Press the 'Ultrasonic Cleaning' function button (Function 1).
- If desired, activate the heating function by pressing the 'Heating Switch' to heat the cleaning fluid up to 45 degrees Celsius for enhanced cleaning.
- Adjust the cleaning time using the control panel.
- Press Start to begin the ultrasonic cleaning cycle.
- After cleaning, turn off the unit and drain the cleaning fluid using the 'Cleaning Agent Drain Valve'.
5.2. Injector Testing Functions
The unit provides various testing modes to evaluate injector performance:
- Idle Speed Test (Function 2): Simulates engine idle conditions.
- Medium Speed Test (Function 3): Simulates medium engine speeds.
- High Speed Test (Function 4): Simulates high engine speeds.
- Accelerating Test (Function 5): Simulates rapid acceleration.
- Variable Speed Test (Function 6): Simulates varying engine speeds.
- Leakage Test (Function 7): Checks for fuel leaks from the injectors.
- Idle Spray Volume (Function 8): Measures fuel volume at idle.
- Medium Spray Volume (Function 9): Measures fuel volume at medium speed.
- High Spray Volume (Function 10): Measures fuel volume at high speed.
- Unit Info (Function 11): Displays unit information.
General Testing Procedure:
- Ensure injectors are correctly installed on the oil rail above the measuring cylinders and connected to signal wires.
- Ensure sufficient testing fluid is in the reservoir.
- Turn on the main power switch.
- Select the desired test function using the control panel buttons.
- Adjust parameters such as pulse width and injecting times as needed for the specific test.
- Adjust the pressure using the 'Pressure Regulating Knob' to the required level, observing the pressure gauge.
- Press Start to begin the test. Observe the spray pattern and fuel volume in the glass measuring cylinders.
- Compare the results across all injectors for uniformity. A faulty injector may show significantly different spray patterns or volumes.

Image: Visual comparison of normal and faulty injector performance in measuring cylinders.

Image: Close-up of the pressure gauge, showing pressure readings.
5.3. Video Demonstration
Watch this video for a visual guide on setting up and operating the BELEY FCM-4C Fuel Injector Cleaner and Tester.
Video: A comprehensive demonstration of the BELEY FCM-4C Fuel Injector Cleaner and Tester, including setup, ultrasonic cleaning, injector testing, and fluid draining procedures.
6. Maintenance
6.1. Fluid Management
- Cleaning Fluid: Use a cleaning agent specifically designed for automotive engine carbon deposits for ultrasonic cleaning.
- Testing Fluid: Use a specialized injector testing fluid. If not available, medical alcohol with a concentration of 75% or higher can be used, but it is not the optimal solution.
- Draining Fluids: After use, drain both cleaning and testing fluids using their respective drain valves.

Image: Draining fluid from the unit using the drain valve.

Image: Ultrasonic cleaning tank with heating function active.
6.2. Oil Pump Replacement
If the oil pump needs replacement, follow these steps:
- Use a screwdriver or Allen wrench to open the side panel on the rear of the device.
- Disconnect the oil pump connection cable, connection pipe, and fixing screws.
- Remove the old oil pump.
- Replace it with a new one, ensuring the hose and connection cable are securely reconnected.
7. Troubleshooting
- Issue: Leakage during testing.
Cause: Using the wrong test fluid. Corrosive liquids can cause rubber seals inside the equipment to corrode and expand, leading to leaks. In severe cases, the oil pump may also be damaged, resulting in no pressure and no fuel injection.
Solution: Always use a special injector testing fluid or medical alcohol (75%+ concentration). Do not add cleaning fluid to the glass tubes for testing. - Issue: No pressure or no fuel injection.
Cause: Damaged oil pump, potentially due to using incorrect fluids.
Solution: Inspect the oil pump. If damaged, replace it following the instructions in Section 6.2. Ensure only recommended fluids are used. - Issue: Unit does not power on.
Cause: Power cable not properly connected, power switch off, or power outlet issue.
Solution: Check power cable connection, ensure power switch is ON, and test the power outlet with another device. - Issue: Ineffective cleaning.
Cause: Insufficient cleaning fluid, incorrect cleaning agent, or short cleaning time.
Solution: Ensure injectors are fully submerged, use a specialized carbon deposit cleaning agent, and increase ultrasonic cleaning time or activate the heating function.
8. Specifications
| Feature | Specification |
|---|---|
| Brand | BELEY |
| Model | FCM-4C |
| Item Weight | 17.11 pounds |
| Package Dimensions | 14.25 x 13.25 x 11.5 inches |
| Power Input | 220V (as per feature bullets) |
| Number of Cylinders Supported | 4 |
| Ultrasonic Cleaning Temperature | Up to 45 degrees Celsius |
| Diesel Injector Testing | Not supported |
| Diesel Injector Ultrasonic Cleaning | Supported |

Image: Dimensions of the BELEY FCM-4C unit.
9. Warranty and Support
BELEY provides a 3-Year Warranty for the FCM-4C Fuel Injector Cleaner and Tester. For any questions or assistance regarding the product, please contact BELEY customer support. They offer 7x24 Hours email support to ensure a satisfactory experience.
