Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #16  
Old 08-14-2015, 12:36 AM
bsmuwk's Avatar
124.051
 
Join Date: Jan 2009
Location: IL / WI
Posts: 913
OM606 fuel supply issues
__________________
-Allen
Artisan Motorenbau
Lakemoor, IL

Chicagoland Mercedes Enthusiast Facebook Group: https://www.facebook.com/groups/mbclubchicago/
Reply With Quote
  #17  
Old 08-14-2015, 08:01 AM
WTB: 94/95 E320 Wagon
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,479
Allen,

That is exactly the link I was going to post as well.

Recently I purchased a new "cigar" fuel hose, which were used in the 123 series on the return line under the hood. I'm planning to install that in the fuel intake line on my OM606 in my '95 sedan, and see if any performance improvements can be had. One of many projects, I'll get around to it someday...
__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~380k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 379k miles
'73 Balboa 20 "Sanctification"
Charleston SC
Reply With Quote
  #18  
Old 08-14-2015, 09:48 AM
Registered User
 
Join Date: Dec 2014
Location: Salt Lake City Utah
Posts: 37
i have come across that thread already during my exhaustive searches of this phenomenon. interesting read.

I have a few experiments of my own planned which involve bypassing the prefiilter to rule out my suspect leaking housing. I will let you know what happens with that.
Reply With Quote
  #19  
Old 08-16-2015, 06:21 PM
Registered User
 
Join Date: Dec 2014
Location: Salt Lake City Utah
Posts: 37
so i just bypassed the prefilter and have a clear line running before that in place of the black fuel line. seriously, no bubbles in the lines at all, not even any backflow bubble at shutoff. I then re-installed everything stock and even gooed up the o rings with some silicone grease, same air bubbles appear as before!. I will next remove and pressure test the filter housing, as I am suspecting there is a leak in the casting. I have read in another post that another member came to the same conclusion, but the thread never led on to whether or not it was fixed.

While I had the clear line in place of the black fuel line, I also re-created the experiment of pinching the tube to try and cut-off the engine, and or see air intrusion a little better...at that point I got the same result as in the linked thread a few posts back where it seems as though the lift pump starts pulling the air out of the fuel, but these were tiny bubbles more like foam that formed.

I will let everyone know how the pressure test goes. maybe we all have filter housings that leak?
Reply With Quote
  #20  
Old 08-16-2015, 11:08 PM
Registered User
 
Join Date: Dec 2009
Location: Newport News, VA
Posts: 287
Quote:
Originally Posted by alaskajones View Post
so i just bypassed the prefilter and have a clear line running before that in place of the black fuel line. seriously, no bubbles in the lines at all, not even any backflow bubble at shutoff. I then re-installed everything stock and even gooed up the o rings with some silicone grease, same air bubbles appear as before!. I will next remove and pressure test the filter housing, as I am suspecting there is a leak in the casting. I have read in another post that another member came to the same conclusion, but the thread never led on to whether or not it was fixed.

While I had the clear line in place of the black fuel line, I also re-created the experiment of pinching the tube to try and cut-off the engine, and or see air intrusion a little better...at that point I got the same result as in the linked thread a few posts back where it seems as though the lift pump starts pulling the air out of the fuel, but these were tiny bubbles more like foam that formed.

I will let everyone know how the pressure test goes. maybe we all have filter housings that leak?
I think the reason for the air is because the design of the pre-filter housing is upside down, with the inlet high and the outlet low. The air you see is likely the same air that was in the pre-filter when it was installed. Perhaps the pre-filter can be filled to the top eliminating all the air, but I have not tried it. Even if this was successful more air would likely get trapped in the pre-filter over time because of it's orientation.
__________________
'97 E 300 D
Reply With Quote
  #21  
Old 08-17-2015, 12:18 AM
Registered User
 
Join Date: Dec 2014
Location: Salt Lake City Utah
Posts: 37
when I had the clear line by-passing the pre filter, i held it up to create an insanely high high spot...the line was about 2 feet long... and no bubbles decided to hang out there...it is a sealed system and any air that was hanging out in the top of the pre filter should just get sucked through and replaced with fuel...since it is supposed to be a sealed system. this tells me the housing must be leaking. (no bubbles before pre filter, bubbles after pre filter, check o rings, goo o rings, bubbles after pre filter, bypass pre filter, no bubbles anywhere, return to stock, check everything again, goo o rings, bubbles back where they were before)

our systems would never self prime if they did not pass air bubbles along. for there to be a magic spot in the top of the pre filter where physics does not apply seems silly to me. the housing must be leaking.

I will accept another reality if i pressure test the housing and cannot conclude it is leaking.
Reply With Quote
Reply

Bookmarks

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 02:34 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page