1. Introduction
The FXTUL F703 Smoke Leak Detector is an essential tool for diagnosing leaks in various automotive systems. Modern vehicles often experience issues indicated by 'check engine' codes, many of which are caused by air or vacuum leaks. This device helps identify these leaks quickly and efficiently, preventing problems such as black smoke from the exhaust, increased fuel consumption, weak engine performance, or idle speed drift.
Exhaust leaks can be detrimental to health and cause carbureted cars to backfire. The F703 smoke machine is designed to detect even the smallest leaks that are invisible to the naked eye, saving time and money on repairs.
2. Safety Information
- Always operate the device in a well-ventilated area.
- Wear appropriate personal protective equipment, including safety glasses and gloves.
- Ensure the vehicle's engine is off and cool before connecting the detector.
- Do not use the device near open flames or sources of ignition.
- Avoid direct contact with the smoke, as it may cause irritation.
- Keep the device away from children and pets.
- Use only the recommended test oil (Paraffin Wax/Baby Oil/Vegetable Glycerin/Mineral oil).
3. Package Contents
Before starting, please verify that all items are present in your package:

Figure 3.1: Package Contents
- FXTUL F703 Smoke Leak Detector Unit
- Power Clamp Cables (for DC12V battery connection)
- Smoke Hose
- Various Pipe Fittings / Adapters
- Rubber Connector
- Hook
- Funnel
- User Manual
4. Product Overview
The FXTUL F703 is a compact and powerful smoke leak detector designed for ease of use and effective leak detection. It features an integrated air pump, eliminating the need for external air sources.

Figure 4.1: F703 Component Diagram
Key Components:
- Hook Port: For hanging the device during operation.
- Oil Refill Port: Where test oil is added.
- Pressure Gauge: Displays system pressure during testing.
- Oil Level Gauge: Indicates the current level of test oil.
- Working Cycle LED: Indicates the operational status.
- Power LED: Indicates power status.
- Start/Stop Button: To initiate or cease smoke generation.
- Power Socket: Connection point for the power clamp cables.
- Smoke Outlet: Where smoke exits the device to be injected into the system.
- Velcro Strap: For securing the device.
5. Specifications

Figure 5.1: Technical Data
| Attribute | Value |
|---|---|
| Power Supply | 12V Vehicle Battery, <8Amp |
| Output Pressure | <1.2bar |
| Flow Rate | <7L/Min |
| Length of Smoke Hose | 2.5 Meters |
| Length of Power Cord | 2.5 Meters |
| Working Cycle | 5 Min auto-stop |
| Dimensions (L x W x H) | 25cm x 18cm x 26cm (approximate package size) |
| Weight | 2.3 kg (approximate package weight) |
6. Setup and Operating Instructions
The F703 is suitable for all types of vehicles, including automobiles, motorcycles, snowmobiles, off-road vehicles, ATVs, light trucks, and speedboats, for pipeline system leakage detection.

Figure 6.1: Wide Application of F703
Leakage Test Operation Steps:

Figure 6.2: Operation Steps of Leakage Test
- Fill Test Oil: Using the provided funnel, fill approximately 20ml of the recommended test oil (Paraffin Wax/Baby Oil/Vegetable Glycerin/Mineral oil) into the detector's oil refill port. Do not overfill.
- Prepare System: Disconnect the pipe or system component that needs to be tested for leaks. Ensure the connection point is clean and accessible.
- Connect Power: Connect the detector to a DC12V vehicle battery using the power clamp cables. Ensure correct polarity (red to positive, black to negative). The device will start to work, and the Power LED should illuminate.
- Inject Smoke: Connect the smoke hose from the detector's smoke outlet to the disconnected pipe or system. Press the Start/Stop button to begin smoke generation. The F703 has its own air pump and can output a large amount of smoke within 30 seconds.
- Check for Leaks: Observe the pipe or system for any visible smoke escaping, which indicates a leak point. The pressure gauge can help monitor system integrity.
- Stop Operation: Once leaks are identified or testing is complete, press the Start/Stop button to cease smoke generation and disconnect the power.

Figure 6.3: Large Smoke Output
Applications:
- Pipeline Leak Test
- Exhaust System Test
- Fuel Tank System Test
- Intake System Test
- Car Sealing Test
- Various Pipe Fittings Test
- Crankcase System Test

Figure 6.4: Powerful Functions
7. Maintenance
Smoke Oil Management:
- This unit uses Paraffin Wax, Baby Oil, Vegetable Glycerin, or Mineral oil as smoke oil. These are commonly available in supermarkets or pharmacies.
- Use a needle-tip bottle or the provided funnel to refill the smoke oil.
- If the smoke oil is overfilled, turn the unit upside down to drain some oil until it reaches the appropriate level on the oil level gauge.
- Every three months, it is recommended to drain all the old oil and refill with new oil to ensure optimal performance and longevity of the device.
General Care:
- Keep the device clean and free from dust and debris.
- Store in a dry place when not in use.
- Inspect cables and hoses regularly for any signs of wear or damage.
8. Troubleshooting
- No Smoke Output:
- Check if the device is properly connected to a 12V power source and the Power LED is on.
- Ensure there is sufficient test oil in the reservoir.
- Verify that the Start/Stop button has been pressed.
- Check for any blockages in the smoke hose or outlet.
- Weak Smoke Output:
- Ensure the oil level is adequate, but not overfilled.
- Replace old smoke oil with fresh oil as per maintenance guidelines.
- Check for proper sealing at the connection point to the vehicle system.
- Device Not Powering On:
- Verify the 12V vehicle battery has sufficient charge.
- Check the power clamp cable connections for secure contact and correct polarity.
- Inspect the power cables for any damage.
- Inaccurate Pressure Gauge Reading:
- Ensure all connections are tight and there are no external leaks in the setup.
- If issues persist, contact customer support.
9. User Tips
- Always use the recommended smoke oil types to prevent damage to the internal components and ensure consistent smoke production.
- For best results, allow the device to warm up for a few seconds after turning it on before injecting smoke into the system.
- When testing, start with lower pressure settings if possible and gradually increase to avoid over-pressurizing sensitive systems.
- After each use, ensure the smoke hose and fittings are clear of any oil residue to prevent clogging.
10. Warranty and Support
FXTUL Official Store provides the following support for your F703 Smoke Leak Detector:
- Original Products: All products purchased from the FXTUL official store are 100% original.
- Warranty: All products come with a 3-year warranty. Please retain your proof of purchase for warranty claims.
- Support: For any technical assistance, troubleshooting, or warranty inquiries, please contact FXTUL customer support.
- OEM/Wholesale: Support for OEM, wholesale, and direct sales is available.





