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 10-04-2003, 12:38 PM
Registered User
Join Date: Jul 2003
Location: HELENA,MT
Posts: 179
Black Fuel

i was changing my fuel filters this am (77 240d ) all the fuel came out black. the pre filter had black specks which would disintegratee when touched. this car is new to me with numerous other issues. is this the dreaded algea problem?

thanks john m

Reply With Quote
Old 10-04-2003, 12:56 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,812
Sounds like it. I had so-so luck with Diesel Doctor. Clears up but returns after a few weeks. Someone recommended Biopor or something like that.

Just what the heck does algae find appetizing in Diesel fuel?

95 S420
91 300SE
87 300SDL
83 300SD
Reply With Quote
Old 10-04-2003, 01:33 PM
Maxwell's Avatar
Registered User
Join Date: Feb 2003
Location: Los Angeles, CA
Posts: 123
A few black spots ain't so bad, I had strings of algae in my tank.
83 240D four bagger stick diesel 276K
Reply With Quote
Old 10-04-2003, 02:23 PM
bjcsc's Avatar
Registered User
Join Date: Nov 2002
Location: Charleston, SC
Posts: 672
Sounds like algae to me. My father turned me on to BioGuard, made by Valvtect. He uses it in his trawler with great success. It's easy to get and only takes 1/2oz per tankful after an initial 1oz treatment. Not only does it kill algae and bacteria, but it also renders them able to be burned up and clears them out. See link below.


1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick
Reply With Quote
Old 10-04-2003, 04:00 PM
Registered User
Join Date: Sep 2003
Location: Central, NJ
Posts: 246

I just went through a month of hell with the very same problem. I had the same condition, tiny black specs clogging my filters and injectors. My '79 300D ran terrible and loud. I thought it best to kill them. This decision was both correct and NOT correct. I killed them alright (forget what I used) and thought the problem was solved. But things got suddenly much worse.

The massive die-off caused the filters (easily changed) and the injectors (not easily cleaned) to become more clogged than prior to my committing mass biocide on the little bugs. My teeth would rattle when idling.

I ended up siphoning the tank and pulling and cleaning the strainer. (Not too hard). Than I had to go through two "cleaning" applications of Redline Diesel Catalyst (12 ozs. per 20 gallons) to get the injectors back to normal again.

Can't find Diesel Purge in NJ, if I could I would have used it. Things are fine now. Good luck.


'79 300D, "Liesel von Diesel", 235K

I kid proofed the house....but they still get in
Reply With Quote
Old 10-04-2003, 10:17 PM
Registered Diesel Burner
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
Why does the BioGuard bottle have two caps on top?

1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
Reply With Quote
Old 10-04-2003, 10:51 PM
The Warden's Avatar
Certified diesel nut
Join Date: Mar 2002
Location: Pacifica (SF Bay Area), CA
Posts: 2,946
One cap goes to the "main chamber" so that, if you want, you can pour the whole thing in. The other goes to a small sub-chamber that's connected by a tube (you can see it on the left) to the main chamber. If you squeeze on the main chamber, you can get some of the stuff to go through into the sub-chamber. THe subchamber is marked, allowing you to measure it out.

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 12:47 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, 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