1. Safety Information
Always read and understand this manual before operating the generator. Failure to follow instructions can result in serious injury or death.
- Operate the generator outdoors in a well-ventilated area to prevent carbon monoxide poisoning. The generator is equipped with a CO Alert sensor for added safety.
- Keep children and pets away from the generator during operation.
- Ensure proper grounding of the generator before use.
- Do not refuel while the engine is running or hot. Allow the generator to cool down before adding fuel.
- Store fuel in an approved container in a well-ventilated area, away from ignition sources.
2. Product Overview and Features
The GENMAX GM4000XiD-NFT is an open-frame dual fuel inverter generator designed for versatility and power. It features a rugged aluminum alloy frame and offers multiple expansion capabilities.
- Rugged and Sturdy Frame: Constructed with aluminum alloy European standard 3030 profile, offering high strength and rust resistance for outdoor use.
- DIY Design: Allows for customization and stacking of multiple units for increased power output.
- Dual Fuel Capability: Operates on both gasoline and LPG (Liquid Propane Gas), providing flexibility during fuel shortages.
- Powerful Control Panel: Equipped with various outlets including 120V AC 30A L14-30R, DC Cigarette Lighter 12V 8.3A, and 2x 120V AC 20A 5-20R outlets. Features a CO sensor, parallel connectors, overload reset switch, and indicator LED lights.
- Strong Load Capacity: Delivers 3200 running watts and 4000 starting watts on gasoline; 3000 running watts and 2800 starting watts on LPG. Produces clean power with THD less than 3%, safe for sensitive electronics.
- Parallel & Series Connection: Two GENMAX 120V ONLY generators can be combined into a 240V generator using a dedicated series parallel box (sold separately).

Figure 2.1: Front view of the GENMAX GM4000XiD-NFT generator, highlighting the control panel and fuel inlets.

Figure 2.2: Detailed view of the generator's control panel, showing various outlets, switches, and indicators.
3. Setup
Before first use, ensure the generator is properly set up.
3.1 Adding Engine Oil
The generator is shipped without engine oil. Add the recommended type and amount of oil before starting. Use the magnetic dipstick for checking oil levels.

Figure 3.1: Illustration of the magnetic oil dipstick, designed to absorb iron filings from the oil.
3.2 Connecting Fuel Source
This generator is designed to be used with an external fuel tank (not included). It supports both gasoline and LPG. Ensure the fuel hose is securely connected to the appropriate inlet on the generator.
Video 3.1: Instructional video demonstrating how to connect an external fuel tank to the GENMAX GM4000XiD-NFT generator, showing different connection options.
3.3 DIY and Expansion Functions
The open-frame design allows for various DIY modifications and expansions, such as adding wheels, armrests, or external fuel tanks. Multiple units can be stacked for increased power.

Figure 3.2: Example of the generator's DIY design, showing how it can be customized with external fuel tanks or other accessories.

Figure 3.3: Illustration of the overlap function, demonstrating how multiple GENMAX generators can be stacked to form a larger power unit.
4. Operating Instructions
4.1 Starting the Generator
Follow the quick start instructions on the generator's control panel. Ensure the correct fuel type (gasoline or LPG) is selected using the fuel choice knob.
4.2 Parallel and Series Connection
For increased power output or 240V operation, two GENMAX 120V ONLY generators can be connected using a dedicated series parallel box (sold separately). This allows for combined running watts of up to 6000W.

Figure 4.1: Diagram illustrating how two generators can be connected in parallel or series for increased voltage or wattage.
Video 4.1: Detailed video guide on setting up and utilizing the parallel and series connection capabilities of the GM4000XiD-NFT generator.
5. Maintenance
Regular maintenance ensures the longevity and optimal performance of your generator.
- Check engine oil level before each use and change it regularly as per the maintenance schedule in the full manual.
- Inspect the air filter and clean or replace as needed.
- Keep the generator clean and free of debris.
- Store the generator in a dry, well-ventilated area when not in use.
6. Troubleshooting
If you encounter issues with your generator, refer to the following common troubleshooting tips. For more complex problems, consult the full product manual or contact customer support.
- Generator not starting: Check fuel level, oil level, spark plug, and ensure the engine switch is in the correct position.
- No power output: Verify circuit breakers are not tripped, check for overload indicators, and ensure connections are secure.
- Unusual noise or vibration: Turn off the generator immediately and inspect for loose parts or obstructions.
7. Specifications
| Feature | Detail |
|---|---|
| Brand | GENMAX |
| Model Name | GM4000XiD-NFT |
| Wattage (Gasoline) | 4000 Starting Watts / 3200 Running Watts |
| Wattage (LPG) | 3000 Running Watts / 2800 Starting Watts |
| Fuel Type | Dual Fuel (Gasoline, LPG) |
| Engine Displacement | 145 Cubic Centimeters |
| Item Weight | 58.4 Pounds |
| Product Dimensions | 24.2"L x 19.5"W x 21.9"H |
| Total Power Outlets | 4 |
| Included Components | Spark Plug Socket Wrench (1), Dual-Purpose Screwdriver (1), Hexagonal Wrench (1), User Manual (1), Warranty Information (1) |
8. Warranty and Support
The GENMAX GM4000XiD-NFT generator includes a 1-year warranty with FREE lifetime technical support from experts. For any inquiries or assistance, please refer to the contact information provided in your warranty documentation or visit the official GENMAX website.





