GENMAX 12V DC Electric Fuel Pump GMEFP Instruction Manual

1. Introduction

The GENMAX GMEFP is a 12V DC electric fuel pump designed to automatically transfer gasoline from an external fuel tank to your GENMAX small inverter generator. This system ensures continuous operation of your generator without manual refueling, enhancing convenience and efficiency.

This manual provides essential information for the safe and effective installation, operation, and maintenance of your GENMAX GMEFP fuel pump. Please read it thoroughly before use and retain it for future reference.

2. Safety Information

WARNING: Gasoline is highly flammable and its vapors are explosive. Always handle fuel with extreme caution.

• Ensure adequate ventilation when handling gasoline.
• Do not smoke or allow open flames or sparks near the fuel pump or fuel tanks.
• Wear appropriate personal protective equipment, including gloves and eye protection.
• Avoid skin contact with gasoline. Wash hands thoroughly after handling.
• Do not overfill the generator's fuel tank. The pump features a fault detection program to prevent excessive refueling.
• Keep the fuel pump and fuel tanks away from heat sources and direct sunlight.
• Ensure all connections are secure to prevent leaks.
• Do not place the fuel hose behind the generator's muffler due to high heat, which poses a fire hazard.
• This pump is designed for gasoline only. Do not use with other fuels or liquids.

3. Product Features

• Automatic Fuel Replenishment: Designed to automatically transfer gasoline to the generator when the fuel level is low, ensuring non-stop operation.
• High Efficiency: Provides efficient fuel transfer for extended generator run times.
• Easy Operation: Simple control panel and quick-plug tubing for user-friendly setup.
• Versatile Power Options: Includes crocodile clips and cigarette lighter plugs for direct connection to 12V DC power sources, including GENMAX small inverter generators.
• Fault Detection: Integrated program protects the generator and prevents overfilling.
• External Tank Compatibility: Supports external fuel tanks with capacities from 5 to 17 gallons (tank not included).
• Wide Generator Compatibility: Suitable for GENMAX inverter generators from 2kW to 5kW, including models like GM2000i, GM2200i, GM2800iAE, GM2800iSAC, GM3200i, GM3300i, GM3500iAD, GM3500iAED, GM4000iSAPC, GM4000iSBEPC, GM4600iAEDC, GM4600iAEFIC, and EU20i.

4. Package Contents

Verify that all items listed below are included in your package:

• GENMAX GMEFP Electric Fuel Pump
• 12V DC Power Plug (with crocodile clips)
• 12V DC Power Plug (cigarette lighter type)
• Fuel Hose with Primer Bulb

5. Setup and Installation

Proper installation is crucial for the safe and efficient operation of the fuel pump. Follow these steps carefully:

5.1 Pre-Installation Check

• Ensure the external fuel tank (purchased separately) is clean and free of debris.
• Verify that the external fuel tank's depth and fuel cap thread match the fuel pump's requirements. The fuel tank depth should be greater than 3.74 inches, the diameter of the fuel tank port should be 2.17 inches, and the thread pitch should be approximately 0.18 inches.
• Confirm your generator is compatible with the GMEFP pump (GENMAX inverter generators 2kW-5kW).

5.2 Connecting the Fuel Pump

1. Install the Fuel Pump: Securely screw the GENMAX GMEFP fuel pump into the fuel tank opening of your generator. Ensure a tight seal to prevent leaks.
2. Connect Fuel Hose to External Tank: Connect one end of the provided fuel hose (with the primer bulb) to the outflow port of your external fuel tank. Ensure this connection is secure.
3. Connect Fuel Hose to Pump: Connect the other end of the fuel hose to the tubing connection port on the GENMAX GMEFP fuel pump. This port indicates fuel flow to the generator.
4. Connect Power: Choose the appropriate 12V DC power plug (crocodile clips or cigarette lighter) and connect it to the 12V DC power cable of the fuel pump. Then, connect the power plug to your generator's 12V DC output or another suitable 12V DC power source.
5. Positioning: Place the external fuel tank on a stable surface, ensuring it is below the generator's fuel tank for optimal gravity feed assistance during priming. Ensure the fuel hose is not kinked and is clear of hot engine components, especially the muffler.

6. Operating Instructions

Once the fuel pump is correctly installed and connected, follow these steps for operation:

1. Prime the Fuel System: Before starting the generator, use the primer bulb on the fuel hose to manually draw gasoline from the external tank towards the pump. Squeeze the bulb until it feels firm, indicating fuel has reached the pump.
2. Start the Generator: Start your GENMAX inverter generator according to its own instruction manual.
3. Activate the Fuel Pump: Locate the switch on the GENMAX GMEFP fuel pump and turn it to the "ON" position. The pump will begin to monitor the fuel level in the generator's tank.
4. Automatic Refueling: When the generator's fuel level drops to a predetermined low point, the GMEFP pump will automatically activate and transfer fuel from the external tank to the generator's tank.
5. Overfill Protection: The pump's internal fault detection system will automatically stop the fuel transfer once the generator's tank is full, preventing overfilling and ensuring safe operation.
6. Continuous Operation: The pump will cycle on and off as needed to maintain the fuel level, allowing for extended, unattended generator operation.

Note: If the generator is not a GENMAX model, ensure its fuel tank depth and fuel cap thread are compatible with the pump before use.

7. Maintenance

Regular maintenance ensures the longevity and reliable performance of your GENMAX GMEFP fuel pump.

• Inspect Connections: Before each use, check all fuel hose and power connections for tightness and signs of wear or damage. Replace any damaged components immediately.
• Clean the Pump: Keep the exterior of the pump clean and free of dirt, dust, and fuel spills. Use a damp cloth for cleaning; do not immerse the pump in water.
• Fuel Filter: Periodically inspect the fuel filter (if accessible) for clogging. Clean or replace as necessary to ensure proper fuel flow.
• Storage: When not in use for extended periods, disconnect the pump, drain any remaining fuel, and store it in a cool, dry place away from direct sunlight and heat sources.

8. Troubleshooting

If you encounter issues with your GENMAX GMEFP fuel pump, refer to the following common troubleshooting steps:

• Pump Not Activating:
  • Ensure the pump's switch is in the "ON" position.
  • Check the 12V DC power connection. Verify the power source is active and the cables are securely connected.
  • Confirm the generator's fuel level is low enough to trigger the pump's automatic activation.
• No Fuel Transfer:
  • Check if the external fuel tank has sufficient gasoline.
  • Ensure the fuel hose is not kinked or obstructed.
  • Prime the fuel system using the primer bulb until fuel is visible or the bulb feels firm.
  • Inspect the fuel filter for clogs.
• Fuel Leakage:
  • Immediately turn off the pump and generator.
  • Inspect all connections (pump to generator, hose to external tank, hose to pump) for tightness.
  • Check for cracks or damage on the fuel hose or pump housing. Replace damaged parts.
  • Ensure the pump is correctly seated and sealed in the generator's fuel tank opening.

If these steps do not resolve the issue, please contact GENMAX customer support for assistance.

9. Specifications

10. Warranty and Support

The GENMAX GMEFP fuel pump comes with a 1-year warranty from the date of purchase.

GENMAX also provides FREE lifetime technical support from experienced experts. If you have any questions, require assistance with installation, operation, or troubleshooting, please do not hesitate to contact GENMAX customer support.

For warranty claims or technical support, please refer to the contact information provided on the GENMAX official website or your product registration materials.