Safety First:
* Disconnect the negative battery terminal before starting any work. This prevents accidental sparks that could ignite fuel vapors.
* Work in a well-ventilated area. Fuel fumes are highly flammable.
* Wear safety glasses and gloves.
* Have a fire extinguisher nearby.
Tools You'll Likely Need:
* Socket set (metric)
* Wrenches (metric)
* Screwdrivers (Phillips and flathead)
* Fuel line disconnect tool (very helpful, prevents damage)
* Pliers
* Jack and jack stands (to safely support the vehicle)
* Fuel pump pliers (may be required depending on your specific vehicle, sometimes called a retaining ring pliers)
* Safety glasses
* Gloves
* Shop rags
* New fuel pump (ensure you get the correct one for your truck)
* Fuel filter (it's a good idea to replace this while you're at it)
General Steps (This is a simplified overview – refer to your repair manual for specifics):
1. Prepare the Vehicle: Disconnect the negative battery terminal. Raise the vehicle securely using a jack and jack stands. Locate the fuel pump access panel, usually under the rear seat (some models may require dropping the fuel tank).
2. Access the Fuel Pump: This is highly dependent on the model. You might need to remove the rear seat, carpet, and potentially some underbody panels to access the fuel pump assembly. Your repair manual will be crucial here.
3. Disconnect Fuel Lines: Use a fuel line disconnect tool to carefully disconnect the fuel lines from the pump. Have rags ready to absorb any spilled fuel.
4. Disconnect Electrical Connections: Carefully disconnect the electrical connectors from the fuel pump.
5. Remove the Fuel Pump Assembly: This typically involves removing a retaining ring or clamp that holds the pump assembly in place. This step may require a fuel pump pliers.
6. Replace the Fuel Pump: Carefully inspect the old fuel pump for any obvious signs of failure. Install the new fuel pump, ensuring it's properly seated and the retaining ring is securely fastened.
7. Reconnect Everything: Reconnect the electrical connectors and fuel lines. Double-check all connections for tightness and proper seating. Carefully lower the vehicle.
8. Reconnect the Battery: Reconnect the negative battery terminal.
9. Prime the Fuel System (If Needed): Some vehicles require priming the fuel system after a pump replacement. Your repair manual will tell you how to do this safely. Usually, involves turning the key to the "on" position (without starting the engine) several times, to let the pump fill the lines with fuel.
10. Check for Leaks: Start the vehicle and carefully check for fuel leaks around the pump and fuel lines.
Important Considerations:
* Fuel Pressure: A fuel pressure gauge can be used to check the fuel system pressure both before and after the replacement.
* Fuel Tank: In some cases, the entire fuel tank needs to be lowered to access the fuel pump. This is a more involved process.
* Repair Manual: Investing in a repair manual specific to your 1998 Chevy Cheyenne is highly recommended. It will provide detailed diagrams, torque specifications, and step-by-step instructions.
This is a complex repair. If you're not comfortable performing this task yourself, take your vehicle to a qualified mechanic. Working with fuel systems is dangerous and improper repairs can lead to serious injury or damage.
