0450905003 | 1973-1978 Porsche 911 Targa 924 & Audi 80 Fuel Filter

Fit In Five Steps

How to replace a Porsche 911 Targa 924 & Audi 80 Fuel Filter?

1.Relieving the Pressure in the Fuel System

In order to relieve the pressure in your fuel system, you will need to run the vehicle without the fuel pump functioning for a short time. In order to prevent the fuel pump from turning on with the engine, you will need to locate the fuse box that contains the fuel pump fuse. Most vehicles have a fuse box both in the interior of the car as well as under the hood. Refer to your vehicle’s owner’s manual to locate the appropriate fuse box. Remove the fuse from the fuel pump. Once you have located the correct fuse box, use the diagram provided on the fuse box cover or in the owner’s manual to identify the fuse that powers the fuel pump. Use a pair of needle nose pliers or plastic tweezers to remove the fuse. Ensure the vehicle is not in gear. Start the engine. Allow the engine to run for a minute before shutting it off. With the pressure relieved from the fuel system and the engine off, you can re-insert the fuse that powers the fuel pump. Place the cover back on the fuse box and return any pieces of the trim you may have needed to remove to access it.

2.Removing the Old Fuel Filter

Now that there is no reason for the engine to be started again until the project is complete, you should disconnect the negative terminal on the battery. Removing the cable from the negative terminal will prevent the engine from being started while you work. You will need to use a hand or socket wrench to loosen the nut holding the cable onto the negative terminal, but you will not need to remove the nut completely. There are two common locations fuel filters are mounted in vehicles, so you should refer to your vehicle’s service manual to help you determine which place to look. The most common location for modern vehicles is along the fuel line on the bottom of the car, just past the fuel pump. In some vehicles, the fuel filter is located in the engine bay on the line that leads to the fuel rail. If the fuel filter is located on the underside of your vehicle, you will need to jack up the car to access it. Slide the jack under the car at one of its designated jack points, then either pump or twist the handle to raise the vehicle (depending on the style of the jack). Although you relieved the pressure in the fuel line, there may be a bit of fuel left in the line that can spill out when disconnected from the fuel filter. 

3.Remove the Fuel Lines from the Filter

Place a bowl or bucket beneath the fuel filter to catch any fuel that drips or pours out. Remove the clips holding the fuel filter in place. Most fuel filters are held in place by two plastic clips. Locate the clips on either side of the cylindrical fuel filter, then use a flat head screwdriver to pop them out of the holes they are in. These clips may break as you remove them, so purchasing replacement clips along with your fuel filter is advised. With the clips removed, slide the fuel lines away from the filter to pop them off of the nozzles on either end. Make sure to tip the fuel lines toward the bowl or bucket in place as you remove them to catch any spilled gasoline. Slide the fuel filter out of its bracket. The fuel filter is likely held in place by a metal bracket that wraps around its outer housing. With the fuel lines disconnected, you can slide the fuel filter out of the bracket by pushing it toward the front of the car. The fuel filter will have a slight bell shape, allowing it to slide out in only one direction.

4.Installing New Fuel Filter

Before installing the new fuel filter, compare it to the one you just removed. Make sure they appear to be the same outside diameter, that the nozzles are the same size, and that it will fit into the bracket. The new fuel filter should easily slide into its bracket. If you have to force it, it is likely not the correct diameter. The fuel filter should stop when it is seated properly, as it should only be able to slide all the way out in one direction. Slide the fuel lines onto the front and back of the filter the same way they were attached to the old one. With the fuel line in place on the filter, slide the plastic clips through the holes on the fuel line nozzle to secure the line in place on the fuel filter.

5.Lower The Vehicle Off Of the Jack Stands

Jack up the car to relieve the weight on the jack stands, then slide them out from beneath the vehicle. Once the jack stands are clear, lower the vehicle to the ground by either releasing the pressure in the jack or turning the jack handle counter-clockwise, depending on your style of jack. Start the engine and check for fuel line at fuel leaks.