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:

Fuel Distributor Replacement

Mike Holloway

Time:

2 hours2 hrs

Tab:

$250 to $1,000

Talent:

**

Tools:

10mm Socket Wrench with Extension, 14mm and 17mm Open End Wrenches

Applicable Models:

Mercedes-Benz R107 (1972-89)

Parts Required:

Fuel Distributor

Hot Tip:

Mark Fuel Injection Lines

Performance Gain:

Better Running Engine

Complementary Modification:

Replace Fuel Lines

The fuel distributor plays an important role in the smooth and efficient running of the engine. The fuel distributor presents fuel into the combustion chamber but can fail over time due to deposits formed by oxidized fuel. You will notice that the fuel distributor has 8 fuel injection lines as well as 8 closing plugs with adjustable Allen screws. These screws are set at the factory.

Before you do any work on your car it is important that you wear safety glasses, work gloves and dispose of all fluids in a safe manner. If you are draining coolant, keep in mind that it is poisonous and should be treated as such. Animals and small children have been known to die from ingesting coolant. If you have to jack up your car, make sure to use jack stands and chock your wheels as well as applying the parking brake. Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability. Always use eye and hand protection.

Begin by removing the ground cable from the battery and making sure it cannot accidentally come in contact with the battery while working.
Figure 1

Begin by removing the ground cable from the battery and making sure it cannot accidentally come in contact with the battery while working.

Disconnect rubber hose leading into the airbox.
Figure 2

Disconnect rubber hose leading into the airbox.

Unscrew the butterfly or wing nut in the center of the lid.
Figure 3

Unscrew the butterfly or wing nut in the center of the lid. With all these removed you simply lift off the airbox. This will help expose the fuel distributor.

In a well-ventilated area, hold a rag over the joint of the fuel control pressure line to prevent fuel spray.
Figure 4

In a well-ventilated area, hold a rag over the joint of the fuel control pressure line to prevent fuel spray. Loosen the fuel control pressure line connected to the large union of the valve from the fuel distributor.

With a 10mm socket wrench, remove the clamp holding the fuel line which is connected to the Cold-start Valve.
Figure 5

With a 10mm socket wrench, remove the clamp holding the fuel line which is connected to the Cold-start Valve.

With a 17mm open end wrench, loosen and disconnect the fuel line which is connected to the Cold-start Valve.
Figure 6

With a 17mm open end wrench, loosen and disconnect the fuel line which is connected to the Cold-start Valve.

With a 17mm open end wrench, disconnect the remaining fuel lines.
Figure 7

With a 17mm open end wrench, disconnect the remaining fuel lines.

Use a marker to number the fuel injector lines located on top of the distributor.
Figure 8

Use a marker to number the fuel injector lines located on top of the distributor.

With a 14mm open end wrench, loosen and remove the fuel injection lines from the fuel distributor.
Figure 9

With a 14mm open end wrench, loosen and remove the fuel injection lines from the fuel distributor.

The fuel distributor can now be lifted off.
Figure 10

The fuel distributor can now be lifted off.

Inspect the fuel injection port for any signs of contamination.
Figure 11

Inspect the fuel injection port for any signs of contamination. You will notice the sheet metal lock which prevents the control piston from dropping out. The sheet metal lock is in place to help in the assembly process and should not be removed.

Notice the deposit of oxidized fuel on the injection port.
Figure 12

Notice the deposit of oxidized fuel on the injection port.

With a flash light, look down into the air flow sensor where the fuel distributor was.
Figure 13

With a flash light, look down into the air flow sensor where the fuel distributor was. Notice in this picture the black deposits. This is an indicator that the combustion chambers as well as the pistons and even rings may have deposits as well. 

Installation is the reversal of removal.

Bookmark and Share
Comments and Suggestions:
Walt Williams Comments: I think you overlooked a step between fig.9 and fig. 10. What holds the fuel distributor down?
June 7, 2016
  Followup from the Pelican Staff: Thanks for the note. We appreciate it. I will have it looked into and if needed have the article updated.
- Nick at Pelican Parts
 
marc-fritz Comments: can I use a 2.6 fuel distributor to a 2.3 190e,can you show me how with some picture.thanks marc-fritz
April 21, 2016
  Followup from the Pelican Staff: Only if the part numbers are the same.

We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
mumbo Comments: I read your question regarding the line of the fuel distributor and was wondering the same thing on my 79 450sl. However after thinking about it, since it is Continuous injection, why would it make any difference in the line up if it is continous ? I overhauled my distributer but can't get the car to run. definately a fuel problem I think since it will run when I pour gas down its guzzle. Curious if you have any other ideas. thanks
January 5, 2016
  Followup from the Pelican Staff: Yes, it makes a difference. Although it is continuous, the fuel is said to be stored at the front of the closed valve then injected once opened with help from throttle suction and the air shroud.

If you have poor timing, engine vacuum can be deceased. This could cause the fuel plate to supply too little fuel.

Start by checking fuel delivery pressure and volume. - Nick at Pelican Parts
 
Steve Groce Comments: Thank you for looking Nick! You don't happen to have the firing order handy for my '79 450sl do you?
June 2, 2015
  Followup from the Pelican Staff: No, I don't have anything that goes that far back. Sorry. - Nick at Pelican Parts  
Steve Groce Comments: What is the routing of the fuel distribution lines on the driver's side on a CIS system on a European model 1979 450SL? I have seen photos where it looks like they are in order on the driver's side like the passenger side and then others that mention the front two are reversed and the rear two are reversed as to the order on the driver's side bank. Mine are all in order except for the back two on the driver's side that are reversed but am not sure that is correct as the car does not run well and I got it in non-running condition but it does start and run now. I am a current customer of Pelican Parts and appreciate your help and support of our cars!!
Thank you, Steve Groce
May 30, 2015
  Followup from the Pelican Staff: I don't have info that goes back that far. You can try to locate the ignition firing order then match it up with the fuel injector lines. - 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: Wed 12/7/2016 02:44:33 AM