1. Introduction
This manual provides essential information for the installation, operation, and maintenance of your Herko 650GE Fuel Pump Module. This module is designed as a direct replacement for compatible Chevrolet Astro and GMC Safari vehicles with 2.5L (1985-1990) and 4.3L (1986-1994) engines. Please read this manual thoroughly before proceeding with installation to ensure proper function and safety.
2. Safety Information
WARNING: Fuel system work can be dangerous. Improper installation or handling of fuel can lead to fire, explosion, serious injury, or death. Always follow proper safety procedures and wear appropriate personal protective equipment (PPE).
- Disconnect the vehicle's battery before beginning any work on the fuel system.
- Ensure the work area is well-ventilated and free from open flames, sparks, or other ignition sources.
- Relieve fuel system pressure before disconnecting any fuel lines. Refer to your vehicle's service manual for specific procedures.
- Wear safety glasses and fuel-resistant gloves.
- Have a fire extinguisher readily available.
- Dispose of fuel and fuel-soaked materials according to local regulations.
- It is highly recommended that installation be performed by a qualified automotive technician.
3. Package Contents
Verify that all components are present and undamaged before beginning installation.
- 1x Herko Automotive 650GE Fuel Pump Module Assembly
Image 1: Herko 650GE Fuel Pump Module Assembly, showing the main unit with fuel lines, wiring, and float arm.
4. Setup and Installation
This section outlines the general steps for installing the Herko 650GE Fuel Pump Module. Specific procedures may vary depending on your vehicle's year and configuration. Always consult your vehicle's factory service manual for detailed instructions.
- Preparation: Park the vehicle on a level surface, engage the parking brake, and block the wheels. Disconnect the negative battery terminal.
- Relieve Fuel Pressure: Follow your vehicle's service manual to safely relieve fuel system pressure.
- Access Fuel Tank: Depending on the vehicle, this may involve lowering the fuel tank or accessing it from under the rear seats/cargo area. Ensure the fuel tank is as empty as possible to reduce weight and spillage.
- Disconnect Components: Disconnect electrical connectors, fuel lines, and any other hoses or sensors attached to the existing fuel pump module. Be prepared for residual fuel spillage.
- Remove Old Module: Carefully remove the retaining ring or bolts securing the old fuel pump module to the fuel tank. Extract the old module from the tank.
- Inspect Tank: Clean any debris from the fuel tank opening. Inspect the fuel tank for rust or contamination.
- Install New Module: Install the new Herko 650GE Fuel Pump Module into the fuel tank, ensuring the new sealing gasket is properly seated. Secure it with the retaining ring or bolts.
- Connect Components: Reconnect all fuel lines, electrical connectors, and hoses. Ensure all connections are secure and free of leaks.
- Reinstall Fuel Tank: If the fuel tank was lowered, carefully raise and secure it back into position.
- Reconnect Battery: Reconnect the negative battery terminal.
- Prime Fuel System: Turn the ignition key to the "ON" position (without starting the engine) for a few seconds, then turn it "OFF." Repeat this process 2-3 times to allow the fuel pump to prime the system and build pressure. Check for any fuel leaks.
- Start Engine: Start the engine and check for proper operation and any warning lights.
Image 2: Top view of the fuel pump module, highlighting the fuel filter and various connections.
Image 3: Detailed view of the electrical connector, ensuring proper wiring connection.
5. Operating Principles
The Herko 650GE Fuel Pump Module is an integral component of your vehicle's fuel delivery system. Once installed and the ignition is turned on, the electric fuel pump within the module activates, drawing fuel from the tank and sending it under pressure through the fuel lines to the engine's fuel injectors. The integrated fuel level sender accurately measures the amount of fuel in the tank and transmits this information to the vehicle's fuel gauge.
This module is designed to operate automatically as part of the vehicle's engine management system, ensuring a consistent and adequate supply of fuel for optimal engine performance.
6. Maintenance
The Herko 650GE Fuel Pump Module is designed for long-term, maintenance-free operation. However, the longevity of the fuel pump can be affected by the overall health of your vehicle's fuel system.
- Fuel Quality: Always use high-quality fuel as recommended by your vehicle manufacturer. Contaminated or low-quality fuel can prematurely wear out fuel system components, including the fuel pump.
- Fuel Filter: While the module includes an internal filter, regular replacement of your vehicle's external fuel filter (if equipped) is crucial to protect the fuel pump from debris. Refer to your vehicle's service schedule for recommended intervals.
- Avoid Running on Low Fuel: Consistently running the fuel tank very low can cause the fuel pump to overheat as it relies on fuel for cooling. Try to keep your fuel tank at least a quarter full.
7. Troubleshooting
If you experience issues after installing the fuel pump module, consider the following common troubleshooting steps. For complex issues, consult a qualified automotive technician.
| Symptom | Possible Cause | Action |
|---|---|---|
| Engine cranks but does not start | No fuel pressure, electrical issue, clogged fuel filter | Check fuel pump fuse/relay. Verify electrical connections to the pump. Check for fuel pressure at the fuel rail. Ensure adequate fuel in tank. |
| Engine stalls after starting | Intermittent fuel supply, low fuel pressure | Check for loose electrical connections. Inspect fuel lines for kinks or leaks. |
| Fuel gauge inaccurate | Faulty fuel level sender, wiring issue | Verify electrical connection to the fuel level sender. Ensure float arm moves freely. |
| Audible whining from fuel tank | Normal operation, or pump straining due to low fuel/clogged filter | Ensure fuel tank is not consistently run low. Consider external fuel filter replacement if applicable. |
8. Specifications
| Model Number | 650GE |
| Brand | Herko Automotive |
| Part Type | Fuel Pump Module Assembly |
| Compatibility | Chevrolet Astro L4 2.5L (1985-1990), V6 4.3L (1986-1994) GMC Safari L4 2.5L (1985-1990), V6 4.3L (1986-1994) |
| Voltage | 12 Volts |
| Fit Type | Vehicle Specific Fit |
| Specification Met | OE (Original Equipment) |
| Item Dimensions (L x W x H) | 8 x 8 x 18 inches |
| Item Weight | 3.17 pounds |
9. Warranty Information
The Herko 650GE Fuel Pump Module Assembly is backed by a Limited Lifetime Replacement Warranty. This warranty covers defects in materials and workmanship under normal use and service. For specific terms, conditions, and claim procedures, please refer to the official Herko Automotive warranty policy or contact customer support.
10. Support and Contact
For technical assistance, warranty claims, or further information regarding your Herko 650GE Fuel Pump Module, please contact Herko Automotive customer support.
Herko Automotive
Please refer to the official Herko Automotive website for the most current contact information.
When contacting support, please have your product model number (650GE) and purchase details readily available.