Here's a general overview. This is NOT a complete guide, and you should consult a repair manual specific to your vehicle's year and model for detailed instructions and diagrams. Improperly performing this repair could result in injury or damage to your vehicle.
1. Safety Precautions:
* Disconnect the negative battery cable. This prevents accidental sparking.
* Work in a well-ventilated area. Gasoline fumes are dangerous.
* Have a fire extinguisher readily available.
* Wear safety glasses and gloves.
* Use appropriate jack stands if working under the vehicle. Never work under a vehicle supported only by a jack.
2. Preparation:
* Locate the fuel pump. It's typically located inside the fuel tank, under the rear seat of the Grand Marquis.
* Gather your tools. You'll need a socket set, wrenches, screwdrivers, possibly a fuel pump removal tool (depending on the design), new fuel filter (recommended), safety glasses, gloves, and possibly a fuel line disconnect tool. A shop manual will give you an exact list.
* Drain the fuel tank. This significantly reduces the risk of spillage and makes the job easier. You can do this by siphoning the gas into approved containers. Never use a vacuum pump or other methods that could create sparks.
* Lower the fuel tank (usually): Access to the fuel pump often requires lowering or dropping the fuel tank. This involves disconnecting fuel lines, electrical connectors, and the tank's straps. Be extremely careful when handling the fuel tank.
3. Fuel Pump Replacement:
* Disconnect fuel lines. This is crucial and often requires specialized tools to prevent leaks. Carefully mark the fuel lines to ensure correct reinstallation.
* Disconnect the electrical connector. This connector powers the fuel pump.
* Remove the fuel pump access cover. This is usually a circular cover on top of the fuel tank.
* Remove the fuel pump assembly. This may involve removing a retaining ring or using a special fuel pump removal tool.
* Install the new fuel pump assembly. Reverse the removal steps, making sure all components are securely seated. Pay close attention to the orientation of the pump and the gasket.
* Reconnect the electrical connector and fuel lines. Double and triple-check everything for leaks.
* Raise the fuel tank (if lowered).
* Reconnect the negative battery cable.
* Check for leaks and start the vehicle. Let it run for a few minutes to check for leaks or other issues.
4. Post-Installation:
* Inspect for leaks. Check all connections for leaks. If you find any, rectify the problem immediately.
* Top off the fuel tank.
* Drive the vehicle. Check for any unusual noises or performance issues.
Again, this is a simplified overview. You must consult a repair manual specific to your 2000 Mercury Grand Marquis. If you're not comfortable performing this repair yourself, take your vehicle to a qualified mechanic. Fuel pump replacement is a potentially hazardous job if not done correctly.
