Mercedes-Benz Parts Catalog Mercedes-Benz Accessories Catalog Mercedes-Benz Technical Articles Mercedes-Benz Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
Bookmark and Share

Pelican Technical Article:

Replacing Your Fuel Filter

Steve Vernon

Time:

1 hour1 hr

Tab:

$25

Talent:

**

Tools:

19mm, 17mm wrench, Philips head screwdriver, hose line clamps

Applicable Models:

Mercedes-Benz W124 (1986-95)

Parts Required:

Fuel filter

Hot Tip:

Make sure filter faces the right direction

Performance Gain:

Proper fuel pressure

Complementary Modification:

New injectors

Your fuel filter is an integral part of the fuel delivery system. A clogged filter can cause all kinds of problems, from a rough running engine to leaving you stranded on the side of the road. Mercedes suggests changing your filter every 30,000 miles.

The Mercedes W124 fuel filter is located on the underside of the car, behind the rear right side seat. You will need to safely lift and support your car. Please see our article on safely jacking up and supporting your Mercedes-Benz.

You will also be working around gasoline so make sure to use eye and hand protection. You will get some spillage no matter what precautions you take especially since the filter will be full of fuel, so be prepared to catch any spills and dispose of the waste according to the regulations in your area.

The fuel filter is located behind the rear seat on the right side of the car.
Figure 1

The fuel filter is located behind the rear seat on the right side of the car. Remove the four 10mm plastic screws (red arrows) and pull the cover down and out. Use care as all kinds of things can collect under the cover.

With the cover off you can see the fuel filter (yellow arrow) mounted beside the fuel pump (red arrow).
Figure 2

With the cover off you can see the fuel filter (yellow arrow) mounted beside the fuel pump (red arrow).

Place a large hose clamping tool on the input line (red arrow) to the fuel pump and the fuel out line from the filter; this will help stop the flow of gas from the lines.
Figure 3

Place a large hose clamping tool on the input line (red arrow) to the fuel pump and the fuel out line from the filter; this will help stop the flow of gas from the lines. Remember the filter will still be full so be prepared. If you do not have the proper tool you can try wrapping vice grips in a rag to pinch the line. Do NOT put the metal teeth against the rubber line. This is also a good time to check your lines for any aging, cracks, bulges or dry rot.

Hold the filter with a'mm wrench (red arrow) and use a 17mm wrench to unscrew the banjo bolt fitting (yellow arrow).
Figure 4

Hold the filter with a'mm wrench (red arrow) and use a 17mm wrench to unscrew the banjo bolt fitting (yellow arrow).

Hold the filter with a'mm wrench (red arrow) and use a 17mm wrench to unscrew the line out fitting from the filter (yellow arrow).
Figure 5

Hold the filter with a'mm wrench (red arrow) and use a 17mm wrench to unscrew the line out fitting from the filter (yellow arrow).

Remember to always replace all the brass washers between the fittings and filter.
Figure 6

Remember to always replace all the brass washers between the fittings and filter.

The filter is designed to flow in one direction (towards the engine).
Figure 7

The filter is designed to flow in one direction (towards the engine). All filters have an indication of flow on them. Make sure to locate the flow direction on the new filter and install it with the arrow (red arrow) pointing in the direction to the engine. The filter and pump are hung on rubber isolator hangers (yellow arrows). This is a good time to inspect them for cracks, rips drying out or any damage that might have happened and replace as needed.

Remove the two Philips head screws, lower the hanger down and remove the fuel filter.
Figure 8

Remove the two Philips head screws, lower the hanger down and remove the fuel filter. Installation is the reverse of removal. Tighten everything down and turn the engine on and then off. The engine might stumble for a moment after starting as the air is removed from the lines. Inspect for leaks before reinstalling the cover.



Bookmark and Share
Comments and Suggestions:
Puggy Comments: Just to say thanks!!! Excellent step-by- step fuel filter removal along with the fuel pump removal instructions. The pictures are worth more than a thousand words!!!
February 27, 2016
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- 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: Mon 12/5/2016 02:38:39 AM