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Pelican Technical Article:

Fuel Filter Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$17 to $30

Talent:

**

Tools:

19mm (2), 17mm wrenches, Philips screwdriver, rags

Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Parts Required:

Fuel filter

Hot Tip:

Use all precautions when working around fuel

Performance Gain:

Better running engine

Complementary Modification:

Test your fuel pressures

A faulty or clogged fuel filter can cause poor engine performance and hard starting problems. When they get completely plugged, you will be left with an engine that doesn't run at all. If your car is starting to stumble under hard acceleration or is generally running rough it may be time to check the fuel filter.

Whether you have a non-Varioram, Varioram, Carrera, C4S or any other 993, the fuel filter is located in the right side of the engine compartment. You will need to remove the airbox lid at the very least and I like to remove the complete airbox; it only takes a few more minutes and gives you a lot more room to get the larger wrenches in place.

Be prepared: Work in a well ventilated area. Keep a fire extinguisher near you at all times and know how to use it correctly. No sparks or open flame around and if you smoke now would be a really good time to quit: at least for the half hour it might take you to perform this job.

Just as with the injectors, pressure regulator or any other component of the fuel system, it's best to relieve the fuel system of any pressure before you go opening it up. You can do this by opening the fuel filler cap and/or removing the fuel pump fuse from the car's fuse panel and then starting the car and allowing it to idle until it runs out of fuel. Also, be sure to use some protective gloves and goggles whenever you're working with fuel.

Some fuel will spill out no matter what you do so be prepared to catch it with some rags and dispose of the rags in accordance with the regulations in your area. Never store fuel soaked rags anywhere; they are very dangerous.

Before you start working on the fuel system let the car cool, then pull back the carpet in the front by the right side A-pillar and release the two clips on the fuse/relay panel cover (red arrows) and remove it.
Figure 1

Before you start working on the fuel system let the car cool, then pull back the carpet in the front by the right side A-pillar and release the two clips on the fuse/relay panel cover (red arrows) and remove it.

Before you begin working on the fuel system you want to de-pressurize it.
Figure 2

Before you begin working on the fuel system you want to de-pressurize it. The best way to do this is to remove the fuel pump and oxygen sensor fuse from the fuse box in the front trunk and then start the engine and let it run out of fuel. Check your owner's manual to determine the right fuse. On our 1995 it was fuse number 26. The panel is set up so fuses 1-15 run along the side and fuses 16-41 run along the top. There is a fuse puller and spare fuses in the box (red arrow). Do not remove the DME relay yet (yellow arrow) as this will not allow the engine to run and you will not be burning the fuel in the system off. Remove the fuel pump fuse and run the motor until it stalls.

Whether you have a non-Varioram, Varioram, Carrera, C4S or any other 993 the fuel filter is located in the right side of the engine compartment (red arrow).
Figure 3

Whether you have a non-Varioram, Varioram, Carrera, C4S or any other 993 the fuel filter is located in the right side of the engine compartment (red arrow).

You will need to remove the airbox lid at the very least and I like to remove the complete airbox; it only takes a few more minutes and gives you a lot more room to get the larger wrenches in place.
Figure 4

You will need to remove the airbox lid at the very least and I like to remove the complete airbox; it only takes a few more minutes and gives you a lot more room to get the larger wrenches in place. Please see our article on removing your non-Varioram and Varioram airboxes for additional instructions

There is a fuel line into the pump (red arrow) that has 17mm and 19mm fittings and the fittings on the line out to the engine are both 19mm (yellow arrow).
Figure 5

There is a fuel line into the pump (red arrow) that has 17mm and 19mm fittings and the fittings on the line out to the engine are both 19mm (yellow arrow).

Even though you have depressurized the system, fuel will still spill out--especially from the lower fitting.
Figure 6

Even though you have depressurized the system, fuel will still spill out--especially from the lower fitting. Place a rag under the fitting to catch the fuel and using a 19mm wrench supporting the filter loosen and remove the out-line (yellow arrow). Use 17mm and 19mm wrenches and separate the in or top line fittings.

Next unscrew the clamp on the filter.
Figure 7

Next unscrew the clamp on the filter. You just need to loosen the clamp until you can slide the filter out: do NOT remove the clamp as it is a pain to get it back together in such a tight space. Installation is the reverse of removal.

There is an arrow on the filter that points in the direction of the fuel flow (red arrow).
Figure 8

There is an arrow on the filter that points in the direction of the fuel flow (red arrow). Make sure this arrow is pointing toward the engine line when installing. Tighten everything up, install the fuse, power the pump up and check for leaks.

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