Here's a general outline. This is not a comprehensive guide, and you should consult a repair manual specific to your 1991 Cadillac Seville for detailed instructions and torque specifications. Improperly following these instructions could lead to injury or damage.
1. Safety First:
* Disconnect the battery's negative terminal. This prevents accidental sparking.
* Ventilate the area. Work in a well-ventilated space, away from any ignition sources.
* Wear safety glasses and gloves.
* Have a fire extinguisher readily available.
* Consider using fuel-safe rags and containers.
2. Preparation:
* Gather tools: You'll need jack stands, jack, socket wrench set (metric), fuel line disconnect tools, pliers, screwdrivers, possibly a fuel pump removal tool, new fuel pump, new fuel filter (recommended), and new fuel pump gasket/seal. A repair manual is crucial.
* Locate the fuel tank: It's typically located under the rear of the vehicle.
* Consult your repair manual: This step is crucial. Diagrams and detailed instructions specific to your vehicle's year and model are necessary.
3. Dropping the Fuel Tank:
* Raise and support the vehicle securely: Use jack stands – never work under a vehicle supported only by a jack.
* Locate the fuel tank straps: These secure the tank to the vehicle.
* Disconnect the fuel lines: This requires caution. Carefully release the pressure in the fuel system (consult your manual for this procedure; it usually involves disconnecting the fuel pump relay) before disconnecting the fuel lines. Use fuel line disconnect tools to avoid damaging the lines.
* Disconnect the electrical connector: This connects the fuel pump to the vehicle's electrical system.
* Disconnect the fuel tank sending unit (fuel gauge): This is usually a separate connector.
* Lower the fuel tank: Carefully lower the fuel tank using straps or supports. You might need to loosen or remove some bolts securing the tank to the vehicle. Be mindful of the fuel lines and electrical connectors to avoid damage.
* Drain the fuel tank: To minimize the risk of spillage, drain the fuel into an approved container. Be aware of local regulations regarding fuel disposal.
4. Fuel Pump Replacement:
* Access the fuel pump: The pump is usually located inside the fuel tank. You might need to remove an access plate on the top of the tank.
* Remove the old fuel pump: This often requires a specialized fuel pump removal tool. Consult your repair manual for the correct procedure.
* Install the new fuel pump: Carefully install the new fuel pump, ensuring the gasket/seal is properly seated.
* Reassemble the tank: Reverse the steps of removing the tank, ensuring all connections are secure and tight.
5. Final Steps:
* Reconnect the fuel lines: Ensure they're securely connected.
* Reconnect the electrical connector.
* Reconnect the battery.
* Lower the vehicle.
* Check for leaks: Carefully inspect for any fuel leaks around the tank and lines.
* Start the engine and check for proper operation: Look for any issues with the fuel system. This could involve checking fuel pressure with a gauge.
Disclaimer: This is a simplified overview. Incorrectly performing this repair can result in serious injury or damage to your vehicle. Always consult a repair manual specific to your 1991 Cadillac Seville before attempting this repair. If you are not comfortable performing this repair yourself, take your vehicle to a qualified mechanic.
