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

LinkBack Thread Tools Display Modes
Old 09-04-2016, 04:07 AM
Registered User
Join Date: Sep 2015
Posts: 71
Diesel purge on OM606....hose size?

Planning on doing a diesel purge on my 98 E300TD, and the easiest way to do it is through the inlet and return fuel line according to this video

.....question is, what's the hose size? It "looks" like it's 3/4" but that's due to me eyeballing it...and Im not accurate when it comes to that.

Anyone know?

Reply With Quote
Old 09-04-2016, 04:36 AM
Registered User
Join Date: Dec 2009
Location: Bedfordshire UK
Posts: 403
The return line to tank is 8mm internal id ,and the line in to fuel heater is 10mm internal id.
So 3/8 and 5/16.
Reply With Quote
Old 09-04-2016, 10:45 AM
Registered User
Join Date: Mar 2014
Location: Philly
Posts: 449
IMO this is an easier, less spillage, quicker way to do a DP on an om606. You do need a preheater to prefilter fuel line to make it work,

my issue was I had the rear elevated to make priming the new filter I installed after purge, all DP how to's suggest putting a new main filter on. Fuel flows very well with an elevated rear so you have to plug off the main feed line coming from the tank in the OP's linked video or get out a bucket to catch the spillage.
87 300TD 227K Miles
99 E300 225K Miles
Reply With Quote
Old 09-04-2016, 08:43 PM
Registered User
Join Date: Sep 2015
Posts: 71
Awesome, thanks for the suggestion. I'll buy some hoses this upcoming Tuesday, or Monday if they're open.

I'm told not to poo open the fuel line if I have more than half tank. I have less than a quarter left...It's right before the fuel light comes on.

But yes, just to be sure, I'll cork it.

I will report back after I do it.
Reply With Quote
Old 09-05-2016, 11:02 PM
Registered User
Join Date: Sep 2015
Posts: 71
Reporting in:

I did the purge. The fuel lines you recommended worked perfect. ACE hardware did not have the coupler to attach the clear hoses to the fuel lines, so I juryrigged a deep socket 8mm socket as a coupler for the inlet fuel line, and simply shoved the 3/8 hose into the return fuel line. Worked perfect.

After 3-4 minutes, the return fuel became dirty very fast. The purge was originally clear with a very slightly pinkish ting, but very soon it became the color of brown mud. I ran it until it was almost empty (used two cans of purge). I will buy a new prefilter and main filter tomorrow when the parts department opens.

Engine runs noticeably smoother. It sounds the same as before, but smoother now. From the driver seat, it's just like being in a regular gasser. If you rolled up the window, you'd never know it was a diesel.

Time will tell if I have power or better mpg.

Reply With Quote


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 03:08 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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