Fuel Filter Replacement DIY - Mercedes-Benz Forum

Go Back   Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W124 E,CE,D,TD Class
New User? Register - Forgot Password

BenzWorld.org is the premier Mercedes-Benz Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 03-26-2011, 08:09 PM   #1 (permalink)
BenzWorld Elite
 
ps2cho's Avatar
 
Date registered: Oct 2006
Vehicle: 1988 300TE, 2002 CLK320
Location: Chandler, AZ
Posts: 3,766
Fuel Filter Replacement DIY

Hosted on my site also here:
http://www.w124-zone.com/articles.php?article_id=41

I thought I'd add it here for you guys to enjoy also for those who have not done it, and more than likely NEED to

----

Fuel Filter Replacement

First off, the importance in changing the fuel filter is second to none for the CIS-E system. It is almost as important as changing the oil on time. The fuel distributor and EHA heavily influence the running condition of the entire engine and are very expensive pieces. The fuel distributor has a micron filter built inside of it which over time collects deposits from old fuel clogging it and reducing performance. This is the reason why replacing the fuel filter is very, very important.

You don't want to have to get the fuel distributor rebuilt any sooner than it has to. It also is very difficult to diagnose since fuel pressure will not neccessarily drop. With my clogged distributor, I noticed a lack in performance and fuel economy, but fuel pressures were within spec. It can make you go crazy

As with all filters, stick with Bosch or MB. Do not get a FRAM or any of those junk filters. The whole point is to limit long term buildup in the distributor, if the filter is not filtering its staying in the distributor, it won't just get blown out the exhaust. (This is the reason why fuel injector cleaning seldom does anything for Bosch CIS-E system....not all, but most dirt doesn't even get to the injectors -- it gets stuck in the distributor.

Difficulty + Cost: Easy with the tools mentioned below. Filter is ~$15.

Change Interval:

Every 30k miles. MB calls for 60k, but experience with CIS-E dictates 30k miles is THE best interval without question. Do not follow a 60k interval.

Additional Inspection - Replace if needed:

Copper crush washers upon removal
Rubber donuts for cracks/aged that hold the pump, filter and accumulator in place
Protective cover for fuel leaks at any of the 3 units.

Tools Required:

Jack
2x 17mm wrench
19mm wrench
10mm socket and extension.
15-20mins job
GERMAN fuel filter. Bosch is perfect.

Procedure:

Factory PDF: http://www.w124-zone.com/downloads/M.../My81/0780.pdf
^ 103 is several pages down. I believe this article covers more than the manual does.

Begin by jacking the car up, you can get away with simply jacking up the passenger rear. Remove the (4) 10mm nuts that hold the protective cover in place. I took the opportunity to completely degrease and scrub clean the cover since I elminated all my oil leaks. You can see the difference....



Clean:



Cover off.
Left = Fuel pump
Middle = Fuel Filter
Right = Fuel accumulator.

Wagons and later models utilize a second fuel pump. The wagons is located in front of the gas tank underneath a small protective cover also.




Counter hold using both 17mm wrenches and crack free. Minimal gas should come out. Check all fuel lines for cracks. I noticed that mine have started to crack, so its on my next purchase order.





Use the 17mm to remove the bolt from the banjo fitting. There are (2) copper crush washers that you should inspect and replace if neccessary. They go on either side of the banjo fitting. The removal of this side of the fuel filter will lose all the gas residing in the filter so have plenty of rags or tissues to catch the fuel remaining in the filter.

On replacement: Counter hold using the 19mm wrench on the filter itself. If you do not counter hold, you cannot tighten this side enough and it will leak. I know how I found out.






New filter going in. The best way I found to do this is to REMOVE the plastic cover you see on the filter and place it in the filter housing FIRST, then slide the filter in otherwise its tricky and not worth pulling on the rubber donuts that may be getting old by now anyway.





New filter in place and everything tightened up.





Get back in the car, turn on the ignition, engine off and check under for leaks (initial may NOT show leaks -- filter is empty!)
Crank the car, it may take 10-20secs of cranking for the filter to fill up. Once car is running, get back under and leak inspect again. Turn car off, repeat to double check. Run car for a couple minutes at least before putting protective cover back on.
__________________
W124-Zone.com
1988 Pearl Grey Metallic Mercedes 300TE - 143k
2002 Silver CLK320 (Girlfriends) - 134k

FS: Brand New Genuine MB 722.3 Oil Pan. PM Me!
FS: Authentic AMG Gen I body kit (local AZ only). PM Me!
ps2cho is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 03-26-2011, 08:30 PM   #2 (permalink)
BenzWorld Elite
 
94Wagenmeister's Avatar
 
Date registered: May 2005
Location: The DC Burbs
Posts: 2,105
Send a message via AIM to 94Wagenmeister
Excellent detail and pics! Much obliged!
__________________
Scott in MD/DC
94 E320 Wagon
"Money can't replace it, no memory can erase it
and I know I'm never gonna find another one to compare"-LW
89 300SE (Waiting for a Hogweed rebuild in Pennsyltucky)
95 C280 (RIP)
87 190E (Sold)
94Wagenmeister is online now   Reply With Quote
Old 03-26-2011, 10:31 PM   #3 (permalink)
BenzWorld Elite
 
Donf's Avatar
 
Date registered: Jun 2010
Vehicle: 300TE$ Toyota "Oh what a feeling!" Hiace
Location: Ward 3 Lockdown
Posts: 5,900
Thank you. It's posts like this that make it possible for nongs like me who aren't very confident to do this sort of stuff.

But in the manual it says to clamp the hose from the tank to avoid fuel going everywhere and emptying the tank. Do you not have to do this?
Donf is offline   Reply With Quote
Old 03-27-2011, 07:07 AM   #4 (permalink)
BenzWorld Elite
 
ps2cho's Avatar
 
Date registered: Oct 2006
Vehicle: 1988 300TE, 2002 CLK320
Location: Chandler, AZ
Posts: 3,766
Quote:
Originally Posted by Donf View Post
Thank you. It's posts like this that make it possible for nongs like me who aren't very confident to do this sort of stuff.

But in the manual it says to clamp the hose from the tank to avoid fuel going everywhere and emptying the tank. Do you not have to do this?
the fuel lines are already old so I wouldn't have done it either way, and I had literally a couple oz come out, barely anything for that side. I see no need to stress the lines at all. They state it to cover their asses in case it pours out. If the fuel cap retains pressure and you don't release it, I think it holds it ok.
ps2cho is offline   Reply With Quote
Old 03-28-2011, 12:47 AM   #5 (permalink)
BenzWorld Elite
 
neanderthal's Avatar
 
Date registered: Dec 2003
Vehicle: 1995 E320
Posts: 2,124
I've changed many a fuel filter. That you weren't sprayed with fuel is a lucky coincidence. Most of the time you will get doused with fuel.

Also, when you first start the car, it is best to turn the key to the on position a few times to get the fuel pump pumping, and pressuring the fuel system. Excessive cranking is NEVER good for your car, no matter the circumstance. Crank for a few seconds, turn off, wait a few seconds, try again. Repeat as necessary.

Good write up otherwise.
__________________
'O=00=O' BMW 2002. long live the legend.

neanderthal is offline   Reply With Quote
Old 03-28-2011, 01:17 AM   #6 (permalink)
BenzWorld Elite
 
Donf's Avatar
 
Date registered: Jun 2010
Vehicle: 300TE$ Toyota "Oh what a feeling!" Hiace
Location: Ward 3 Lockdown
Posts: 5,900
Excellent write up and fantastic pics.

But the underneath of your car is disgusting...
Donf is offline   Reply With Quote
Old 06-29-2012, 06:34 PM   #7 (permalink)
BenzWorld Newbie
 
Standamac's Avatar
 
Date registered: Jan 2012
Vehicle: W124 E320 1995/Special Edition
Location: Norfolk, VA
Posts: 4
Thanks

This thread save the day. My old fuel filter was after market and it must have been bad. Mediocre take offs and low rpm not very aggressive. I bought a replacement Bosch fuel filter and put it on using your thread. Once installed the rmps are very high when in neutral when I rev the engine. I am very please and ready to take my 1995 W124 E320 out on the highway!
Standamac is offline   Reply With Quote
Old 07-01-2012, 09:47 PM   #8 (permalink)
BenzWorld Member
 
Date registered: Apr 2009
Vehicle: 1995 E320 Cabriolet, 2007 E350 Sport P2, 1995 E420
Location: Hawaii
Posts: 382
Excellent write up. Did this on the E420 today it's the same procedure. Cracking the 17mm connection-not the banjo bolt- was a real pita. Also the Phillips screw on the clamp has a nut that it screws into so if you loosen it too much watch out for the nut. Ask me how I know.
vexed is online now   Reply With Quote
Old 07-02-2012, 12:43 AM   #9 (permalink)
BenzWorld Elite
 
lowesguy's Avatar
 
Date registered: Feb 2011
Vehicle: 91 500SL ,90 300SE, 91 300E sold , 92 300E ,02 Kia Sedona starship cruiser
Location: Temecula Ca
Posts: 5,071
More info needed on fuel distributor screen, and how to clean it, tomorrow doing filter and pump on my90se M103, forgot about the screen at FD,like to check that while I'm at it
__________________
John
lowesguy is offline   Reply With Quote
Old 02-01-2014, 02:42 PM   #10 (permalink)
BenzWorld Junior Member
 
Date registered: Feb 2012
Vehicle: 1988 W124 300 CE KAT
Location: Portugal
Posts: 13
How important is the plastic sleeve around the filter?
Mine was so brittle, it broke in a million pieces when I was removing the old filter...
AlexandrePT is offline   Reply With Quote
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W124 E,CE,D,TD Class

Bookmarks



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Topic Author Forum Replies Last Post
Fuel Filter replacement DIY S430 atmsmshr W220 S-Class 29 03-15-2014 01:03 PM
DIY: 2000 C230 Kompressor Fuel Filter Replacement Mercedes Benz of Florida W202 C-Class 13 10-28-2010 08:50 AM
DIY - Green Filter Air Filter Replacement for SLK350 - 20 minutes SLK350and350Z R171 SLK Class 16 07-14-2009 05:36 PM
Photo DIY- Fuel Filter Replacement W463 G-AMG G-Class 3 05-16-2009 10:58 AM


All times are GMT -7. The time now is 11:11 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.1

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.