Before you begin, consider these crucial safety points:
* Disconnect the battery's negative terminal. This prevents accidental sparks that could ignite fuel vapors.
* Work in a well-ventilated area. Fuel vapors are extremely flammable and dangerous.
* Use proper safety equipment. This includes gloves, eye protection, and possibly a respirator.
* Have a fire extinguisher readily available.
* Consider professional help. If you're not comfortable with automotive repair, this is a job best left to a qualified mechanic. Improper handling can lead to serious injury or even death.
General Steps (This is not a comprehensive guide; consult a repair manual specific to your vehicle):
1. Raise and secure the vehicle. Use jack stands to support the vehicle securely. Never work under a vehicle supported only by a jack.
2. Disconnect the fuel lines. This involves carefully releasing the pressure in the fuel system (often by disconnecting the fuel pump relay). There will be fuel in the lines, so be prepared for a small amount of spillage. Use appropriate fuel-resistant containers to catch any spilled fuel.
3. Lower the fuel tank. This usually involves disconnecting various electrical connectors and fuel lines, and then lowering the tank using straps or a fuel tank lowering tool. The exact procedure depends on your vehicle's design.
4. Access the fuel pump. Once the tank is lowered, the fuel pump assembly will be visible. It's typically held in place by a retaining ring or clamp.
5. Remove the fuel pump assembly. Carefully detach the electrical connector and any other attached components.
6. Install the new fuel pump assembly. This is the reverse of the removal process. Ensure a tight and secure fit.
7. Raise the fuel tank. Carefully re-secure the fuel tank and reconnect all lines and electrical connections.
8. Lower the vehicle.
9. Reconnect the battery.
10. Prime the fuel system. This may involve several cycles of turning the ignition key to the "on" position without starting the engine, allowing the fuel pump to build pressure. Consult your repair manual for the precise procedure.
11. Start the engine and check for leaks.
You will need:
* Jack and jack stands
* Fuel tank lowering straps or tool
* Wrenches and sockets of various sizes
* Fuel line disconnect tool
* New fuel pump assembly
* Fuel-resistant containers
* Safety glasses
* Gloves
* A repair manual specific to your 1999 Cadillac Escalade (highly recommended)
Disclaimer: This information is for general guidance only. Improper repair can result in injury or damage to your vehicle. Always refer to a professional repair manual for detailed instructions and safety precautions specific to your 1999 Cadillac Escalade before attempting this repair. If you are not comfortable performing this repair yourself, take your vehicle to a qualified mechanic.
