How to Change the Fuel Filter on a '94 Mercury Grand Marquis
- 1). Park your Mercury Grand Marquis on level ground in a safe location. Make sure the area is well ventilated or outdoors. Apply the parking brake. Unscrew the gas filler cap from the fuel tank on the driver's side. Open the hood and disconnect the negative cable from the battery.
- 2). Crawl underneath the vehicle from the driver's side. Look for the fuel filter mounted to the vehicle chassis just below the driver's seating area. You should be able to identify the fuel filter as a metal cylinder attached to a black hose. This hose is your fuel line and it should run from the fuel tank at the rear of the vehicle to the engine.
- 3). Notice that the area between the fuel filter and the fuel line is covered by a set of push-connect fittings. Remove these fittings using a flat-head screwdriver. Simply slide the screwdriver between the legs of the clips and push outwards until the legs of the clips open up. Remove the push-connect fittings and set them aside. The fuel line should disconnect from the fuel filter when you remove the push-connect fittings. If the fuel line does not disconnect, pull on the fuel line until it detaches from the fuel filter.
- 4). Loosen the fuel filter retaining clamp that secures the filter to the chassis of the vehicle. You should be able to loosen the retaining clamp using your hands. If the clamp appears stuck, use an adjustable wrench. Slide the fuel filter out of the retaining clamp and discard it.
- 5). Slide a new fuel filter into the retaining clamp. Tighten the retaining clamp over the fuel filter to secure it to the chassis. Align the fuel line with the inlet and outlet lips of the fuel filter. Push the fuel line onto the fuel filter until you hear an audible click. Attach the push-connect fittings over the area where the fuel line and the fuel filter meet.
- 6). Crawl from underneath the vehicle. Go to the hood area and reconnect the negative cable to the battery. Tighten the gas filler cap to the fuel tank. Turn on the ignition and allow the car to idle for a few minutes to pressurize the fueling system.
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