1993 Nissan Altima Replace Fuel Pump
The 1993 Nissan Altima is a four-door sedan, with a 2.4 liter or 2.5 liter in-line four-cylinder engine. The engines use a multiport fuel injection system, with individual fuel injectors located in the intake manifold for each cylinder. The fuel injection pump, like most fuel pumps on fuel injected vehicles, is mounted inside the fuel tank with the fuel gauge sending unit. The fuel pump can be replaced without having to remove the fuel tank.
 Tools Used
|Ratchet and socket set|
|Small pocket-sized flat screwdriver|
 Replacing Fuel Pump
- Park the Altima on a firm, level surface. Shut off the engine and set the parking brake.
- Relieve the fuel pressure by removing the fuel pump fuse. The fuse panel is located under the driver's side of the dash. The fuse location is indicated on the fuse panel cover. Start the engine and allow it to run until it dies. Open the hood and use the ratchet and socket to disconnect the negative battery cable.
- Remove the rear seat by using a ratchet and socket to remove the two bolts from the lower seat cushion. The bolts are located where the seat cushion meets the floorboard. You'll see a small notch on each side of the seat. The bolts are recessed in the notches. Lift up the front of the seat cushion and pull it away from the seat back. Remove the cushion and set it aside.
- Use a ratchet socket to remove the two bolts that hold the seat back to the body. The bolts are located at the bottom corners of the seat back. Open the trunk and remove the two bolts that hold the seat back to the body. Remove the seat back and set it aside. Move back to the rear passenger compartment and use the ratchet socket to remove the bolts from the top shield that was exposed when you removed the seat back. The trunk shield is a large metal plate that is attached to the body, behind the seat back.
- Use a ratchet and socket to remove the fuel pump cover located in the middle of the floorboard. Lift up the cover and disconnect the two electrical connectors from the fuel pump/fuel sending unit assembly. Use needle-nose pliers to open the clamp on the return line. Slide the clamp back back on the line and pull those off the fitting. Use a Phillips screwdriver to loosen the hose clamp on the pressure line. Slide the clamp back on the line and pull the line off the fitting.
- Place a flathead screwdriver against one of the tabs on the fuel pump assembly lock ring. Tap the end of the screwdriver with a hammer in a counterclockwise direction to loosen the ring. Finish unscrewing the ring by hand, lift the ring off and set aside. Lift up the fuel pump assembly and disconnect the two electrical connectors. Wrap masking tape around the fuel lines and mark them with a marker so you can put them back on the proper fuel fittings. This is important because one fitting is the "pressure," line and the other is the "return" line. Use needle-nose pliers to open the hose clamp on each hose, slide the clamp back and remove the hoses.
- Reach inside the fuel tank and squeeze the two tabs on top of the fuel pump holder to release it from its bracket. Pull out the pump. Use a small pocket-size screwdriver to remove the clip that holds the fuel filter to the bottom of the fuel pump. Use a flat screwdriver to carefully pry the filter off the pump. Use a flathead screwdriver to pry up the blocking tab on the fuel pump holder. Slide the pump out of the holder.
- Reverse these steps to install the fuel pump.
 Tips & Warnings
- Work in a well-ventilated area. No smoking. Keep away from water heaters and furnaces. No bare lightbulbs. If you use a work light, use the fluorescent type that has a clear plastic housing over the bulb.