1. Introduction
The FOXWELL SD201 Automotive Smoke Machine is a professional diagnostic tool designed to quickly and accurately detect leaks in various vehicle piping systems. This device helps identify issues such as vacuum leaks, fuel pipe leaks, oil leaks, and EVAP system leaks, preventing minor problems from escalating into costly repairs. Its integrated air pump and advanced features make it a reliable tool for both professional mechanics and DIY enthusiasts.

2. Product Overview
2.1. Components
The FOXWELL SD201 package includes the following items:
- SD201 Main Unit
- Smoke Tube
- Power Cord (with battery clamps)
- Inflatable Adaptor
- Hook
- Funnel
- Intake Adaptor Core
- Air Drum Rubber
- User Manual

2.2. Device Features and Controls
The SD201 unit features a user-friendly design with clearly labeled ports and indicators:
- Oil Filler: Port for adding smoke oil.
- Liquid Level Window: Visual indicator for smoke oil level.
- Smoke Vent: Output port for smoke.
- DC12V Input: Power input for the device.
- Work Air Inport: Air intake for the internal pump.
- Power Indicator: Light indicating power status.
- Run Key: Button to start smoke generation.
- Stop Key: Button to stop smoke generation.
- Hook: For convenient hanging during operation.

2.3. Key Advantages
- Built-in Air Pump: Eliminates the need for an external air compressor, enhancing portability and ease of use.
- Variable Frequency Control: Allows for continuous operation even under high-temperature protection, ensuring consistent performance.
- Overheat & Anti-frost Protection: Equipped with intelligent protection devices that automatically shut down the unit if the temperature exceeds 75°C (167°F) or if operating in extreme cold, ensuring safety and device longevity.
- Extended Work Cycle: Offers a 10-minute continuous work cycle, longer than many competitors, suitable for testing larger systems.
- Wide Application: Compatible with a broad range of 12V vehicles including cars, motorcycles, snowmobiles, ATVs, light trucks, and pickup trucks.



3. Specifications
| Feature | Specification |
|---|---|
| Brand Name | FOXWELL |
| Model | SD201 |
| Origin | Mainland China |
| Feature | Built-in air pump |
| Use Liquid | Baby oil (not included) |
| Smoke Output Value | 6l/min |
| Output Pressure | 0.8-1.2 bar |
| Flow Rate | 16 L/Min |
| Voltage | DC12V |
| Current | 6A |
| Operating Temperature | 20°C (68°F) |
| Overheat Protection | Up to 248°F (120°C) |
| Anti-frost Protection | Down to -68°F (-55°C) |
| Work Cycle | 10 minutes continuous operation |
| Supported Vehicles | Motorcycle, Passenger Vehicle, Boat, Snowmobiles, ATVs, Light Trucks, Pickup Truck (supports all 12V vehicle batteries) |
| Warranty | 3 Year |
4. Setup
- Prepare Smoke Oil: Open the Oil Filler port on the top of the SD201 unit. Using the provided funnel, carefully inject 10ml-20ml of test oil (baby oil is recommended) into the unit. Do not overfill; ensure the liquid level is below the MAX mark on the Liquid Level window.
- Connect Power: Connect the red clamp of the power cord to the positive (+) terminal of a 12V vehicle battery and the black clamp to the negative (-) terminal. Ensure a secure connection. The Power Indicator light should illuminate.
- Attach Smoke Tube: Connect one end of the smoke tube to the Smoke Vent port on the SD201 unit.
- Prepare Vehicle System: Identify the pipeline system you wish to test for leaks. This could be the engine's vacuum lines, fuel pipes, or the EVAP system. Ensure the system is accessible and any necessary components (like pressure test valves for EVAP) are removed or prepared for connection.
- Connect Adapter: Select the appropriate adapter (e.g., inflatable adapter, intake adapter core) and connect it to the vehicle's system. Then, connect the other end of the smoke tube to this adapter. Ensure all connections are tight to prevent smoke leakage during the test.
- Position Device: Use the integrated hook to hang the SD201 unit securely under the vehicle's hood or in a stable position.
5. Operating Instructions
- Start Smoke Generation: Once the setup is complete and all connections are secure, press the 'Start' key on the SD201 unit. The device will begin generating smoke.
- Observe Smoke Output: Smoke will start flowing through the connected tube and into the vehicle's system. The SD201 is designed to output a large amount of smoke within 10 seconds.
- Identify Leaks: Carefully observe the vehicle's system for any visible smoke escaping from unexpected areas. Smoke indicates a leak point. For EVAP systems, specifically check around the fuel tank, lines, and charcoal canister.
- EVAP Testing Specifics:
- Remove the pressure test valve from the EVAP system.
- Connect the appropriate adapter to the opening.
- Start the smoke test as described above.

A three-step visual guide showing how to perform an EVAP test: 1. Remove the Pressure Test Valve, 2. Connect the Adapter, 3. Start Test. - Stop Smoke Generation: Once the leak is identified or the test is complete, press the 'Stop' key on the SD201 unit.
- Disconnect: Disconnect the smoke tube from the vehicle and the SD201 unit. Carefully remove the power clamps from the vehicle battery.

6. Maintenance
- Clean After Use: After each use, ensure the smoke tube and adapters are free from any residue. Wipe down the main unit with a clean, dry cloth.
- Check Smoke Oil Level: Regularly monitor the smoke oil level through the Liquid Level window. Refill as needed, ensuring not to exceed the MAX line.
- Storage: Store the SD201 unit and its accessories in a cool, dry place, away from direct sunlight and extreme temperatures.
- Avoid Contamination: Prevent foreign objects or contaminants from entering the oil filler port or smoke vent.
7. Troubleshooting
- No Smoke Output:
- Check if the power clamps are securely connected to a 12V vehicle battery.
- Ensure sufficient smoke oil is present in the unit.
- Verify that the 'Start' key has been pressed.
- Check for any blockages in the smoke tube or adapters.
- Device Shuts Off During Operation:
- The device may have activated its overheat protection. Allow it to cool down for at least 10 minutes before resuming operation.
- Ensure the vehicle battery provides stable 12V power.
- Smoke Leaking from Connections:
- Ensure all connections (smoke tube to unit, smoke tube to adapter, adapter to vehicle system) are tightly secured.
- Check if the adapters are correctly sized and sealed for the specific vehicle port.
- Inaccurate Leak Detection:
- Ensure the entire system being tested is properly sealed before introducing smoke. Any unsealed openings will cause smoke to escape, making it difficult to pinpoint the actual leak.
8. User Tips
- Smoke Oil Recommendation: For optimal performance, it is advised to use baby oil as the smoke fluid.
- Power Connection: Always connect the red clamp to the positive (+) terminal and the black clamp to the negative (-) terminal of the 12V vehicle battery. Incorrect polarity can damage the device.
- Testing Time: Once smoke is introduced into a sealed pipeline, you can typically expect the system to be filled with smoke within about 1 minute. If a leak is present, results can often be observed within 3 minutes.
- Safety First: Always operate the device in a well-ventilated area. Avoid inhaling the smoke directly.
9. Warranty and Support
The FOXWELL SD201 Automotive Smoke Machine comes with a 3-year warranty from the date of purchase. For technical assistance, troubleshooting, or warranty claims, please contact FOXWELL customer support through their official channels. Keep your purchase receipt as proof of purchase for warranty services.





