Porsche Parts Catalog Porsche Accessories Catalog Porsche Technical Articles Porsche Tech Forums
 
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
Bookmark and Share

Pelican Technical Article:

Fuel Filter Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$20 to $30

Talent:

**

Tools:

19mm, 18mm wrenches, hose clamp, 13mm socket, Philips and flathead screwdriver, rags, floor jack, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

Porsche 944 (1983-89)
Porsche 944 S2 (1989-91)
Porsche 944 Turbo (1986-89)
Porsche 944S (1987-88)

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.

The fuel filter is located under the vehicle near the tank on the right side. When replacing, work in a well-ventilated area. Working outdoors is a good choice. Do not use incandescent work lights or power tools and DO NOT smoke: fuel and fuel vapors are highly combustible.

You will need to safely raise and support the rear of the vehicle. Please see our article on safely raising and supporting your Porsche 944.

Begin by removing the fuse panel cover (red arrows).
Figure 1

Begin by removing the fuse panel cover (red arrows). You are going to want to try and depressurize the system and get as much fuel out as possible.

Remove the DME relay and try and start the motor several times.
Figure 2

Remove the DME relay and try and start the motor several times. The DME relay controls the fuel pump. With the pump not running and the engine cranking this will help with getting some of the fuel out of the lines. This will not prevent some fuel from still spilling out so be prepared.

If your fuel pump and filter has a cover over it (yellow arrow), you will need to use a 13mm socket and remove the single bolt that holds the hanger in place (red arrow).
Figure 3

If your fuel pump and filter has a cover over it (yellow arrow), you will need to use a 13mm socket and remove the single bolt that holds the hanger in place (red arrow).

The cover is made up of two sections; remove the two Philips head screws (red arrows), and separate the rear section of the cover (yellow arrow).
Figure 4

The cover is made up of two sections; remove the two Philips head screws (red arrows), and separate the rear section of the cover (yellow arrow).

This will give you access to the fuel supply line from the tank.
Figure 5

This will give you access to the fuel supply line from the tank. Use a set of hose clamps to clamp this line off (red arrow).

Now you can look up above the axle and see the filter; there is a supply side from the fuel tank (red arrow) and a feed side to the engine (yellow arrow).
Figure 6

Now you can look up above the axle and see the filter; there is a supply side from the fuel tank (red arrow) and a feed side to the engine (yellow arrow).

Brace the fitting on the filter (red arrow) with a 19mm wrench and use a 18mm wrench to remove the line (yellow arrow).
Figure 7

Brace the fitting on the filter (red arrow) with a 19mm wrench and use a 18mm wrench to remove the line (yellow arrow). Perform the same procedure for removing the line out from the filter.

Next, unscrew the clamp on the filter (red arrow).
Figure 8

Next, unscrew the clamp on the filter (red arrow). 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 (yellow arrow). Make sure this arrow is pointing toward the engine line when installing. Tighten everything up, remove the clamp, install the DME relay, power the pump up and check for leaks.





Bookmark and Share
Comments and Suggestions:
Pilotony Comments: Just want to know what is the sizes of the bolts that hold the cover hanger. The previous owner lost it.
October 12, 2016
  Followup from the Pelican Staff: I am not 100% sure. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Zeke Comments: The car has spark, fuel pressure, compression... obviously something is missing. I think it is something electrical because like i said. It will start up instantly, then cut of right when it starts. After that I will try and start it again and all it does is turn over. I replaced the fuel filter and nothing has changed. It will not do the typical "start up and die" thing unless I wait another 24 hours or so.
March 24, 2016
  Followup from the Pelican Staff: I hate to go back and forth, but if you had fuel, spark and compression, the engine would run. End of story. That is the recipe for a running engine. When the engine doesn't start, you will have to see which of those goes away. Then you can diagnose as to why the item is missing. - Nick at Pelican Parts  
Zeke Comments: I have a 1989 944 2.7 base, the car has new injectors and a new fuel pump. The car will start SOMETIMES. When it does it runs fine... but when it doesnt start itjust turns over and its not getting fuel. Or it starts for a second and the boggs down and dies instantly. I hope it just needs a new fuel filter. What do you think it is???
March 13, 2016
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
Rog Comments: I have a 83 944 the only way to keep the engine running is to keep the gas pedal pushed letting up kills engine could this be a fuel filter that's super clogged?
February 10, 2016
  Followup from the Pelican Staff: Doubtful. More likely air delivery. Only way to be sure is to test fuel pressure and volume. - Nick at Pelican Parts  
jeff Comments: Hi Nick

Much appreciate your help.

Jeff
November 20, 2015
  Followup from the Pelican Staff: Any time. - Nick at Pelican Parts  
Jeff Comments: Hi Guys

Thanks for the response. The car always starts and runs ok, it is only when really pushed hard did it completely cut out. When the car stopped rolling, I turned the ignition key and it started again just like normal. Only under heavy load did the engine cut out. I don't have a diagnostic to check error codes.
Thanks again.

Jeff
November 19, 2015
  Followup from the Pelican Staff: Check exhaust back pressure and the fuel delivery system. - Nick at Pelican Parts  
Jeff Comments: Hi Guys

I have a 1986 944 turbo only 103,00 kms, quite a charmed life! and recently on two separate occasions when pushing it very hard the engine has completely stopped. It boosts ok as well but only in the high rev range approx. 5,500 rpm was when it stopped. I just changed the fuel filter thinking that would fix it but it just happened again. Air filter is a K&N and is quite ok. Any ideas?
November 5, 2015
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Fri 12/2/2016 02:51:56 AM