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
  #1  
Old 11-05-2003, 05:28 PM
ready-ronnie's Avatar
ready-ronnie
 
Join Date: Feb 2003
Location: BERRIEN SPRINGS, MICHIGAN
Posts: 171
Question fuel filter question with diesel purge

I have diesel purge and both fuel filters and Ive read all the threads, but I don't know if I should change the filters before or after I use the diesel purge??? Thanks for any help
__________________
1998 E300Turbodiesel
1980 300d

Ready- Ronnie
Reply With Quote
  #2  
Old 11-05-2003, 05:52 PM
84W123DT
Guest
 
Posts: n/a
Re: fuel filter question with diesel purge

Quote:
Originally posted by ready-ronnie
I have diesel purge and both fuel filters and Ive read all the threads, but I don't know if I should change the filters before or after I use the diesel purge??? Thanks for any help
It would be recommended to do a DP first (to clean the injectors and any dirt will be captured by the old filters) and replaced the Pre and Main fuel filters after.
Reply With Quote
  #3  
Old 11-05-2003, 07:40 PM
Registered User
 
Join Date: Jan 2000
Location: PA
Posts: 5,440
Ready,

I wouldn't replace either of the filters if they didn't display any indication of a restriction in the fuel flow.

P E H
Reply With Quote
  #4  
Old 11-06-2003, 12:52 AM
rdanz's Avatar
Registered User
 
Join Date: Sep 2002
Posts: 1,158
Quote:
Originally posted by P.E.Haiges
Ready,

I wouldn't replace either of the filters if they didn't display any indication of a restriction in the fuel flow.

P E H
How would they display a restriction? and how often should they be changed?
Reply With Quote
  #5  
Old 11-06-2003, 08:41 AM
Marshall Booth
Guest
 
Posts: n/a
Mercedes fuel filters are scheduled to be replaced every 30kmi, but I have found that with a little care on my part to buy fuel from reliable vendors, modern fuel delivery methods provides fuel of sufficient quality to often allow the filters to last MUCH longer. I have several that are fine after 60-80kmi. I do eliminate any water in the fuel several times a year with fuel anti-freeze or anti-gel, so any residual water trapped by the filter is sequestered and consumed.

Signs of fuel filter contamination is usually a restriction to full flow. This only occurs when the engine is fully loaded and you are at relatively high rpm (4000+). A quick check is to measure the acceleration from 0-62 mph (0-100 km/h) and when it creaps up a second or two, it's probably time. When the weather gets cold, if you've not been diligent about filling in winterized fuel, as the fuel starts to cloud (that's at about freezing) a slightly occluded filter will allow the wax particals to restrict flow and power will be restricted (the engine will usually start and idle okay). A slightly restricted filter will paradoxically often result in INCREASED fuel consumption. If you are driving largely in the city (where maximum power is seldom required) this increased fuel consumption may be the first signs of a clogged filter.

Just ONE load of "bad" fuel however, and you may need to change filters even if you put in new ones YESTERDAY! Use only OEM filters (Mann, Hengst, Knecht, Bosch are all OEM for Mercedes fuel filters).

Marshall
Reply With Quote
  #6  
Old 11-06-2003, 12:44 PM
84W123DT
Guest
 
Posts: n/a
Cost Effective Maintenance

It takes about $10.00 and 30 minutes to replace the fuel filters. A very reasonable maintenance cost to ensure clean fuel entering the fuel system. I change mine 3 to 4 times per year (evry season change) and use Howes diesel conditioner in the tank each fill-up. The cars run smooth!

My $0.02
Reply With Quote
  #7  
Old 11-06-2003, 12:54 PM
Registered User
 
Join Date: Jan 2003
Location: Reno/Sparks, NV
Posts: 3,063
I believe it's better to change the filters before doing Diesel Purge otherwise the DP may clean out the dirty filters too and bring some of the junk through your injectors. Plus new filters will ensure unobstructed flow of the DP for better cleaning of the injectors.
__________________
2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL
Reply With Quote
  #8  
Old 11-06-2003, 01:14 PM
SW SW is offline
Registered User
 
Join Date: Aug 2000
Location: Houston, TX. USA
Posts: 590
FWIW, I once ran DP (method where DP is the fuel tank) and the inline filter sort of melted.
__________________
2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
-------------------------------------
'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold
Reply With Quote
  #9  
Old 11-06-2003, 01:23 PM
Marshall Booth
Guest
 
Posts: n/a
If Diesel Purge melted the in-line filter, then it WASN'T an OE filter. I've used Diesel Purge with all the OE brands and it's NEVER melted anything!

Marshall
Reply With Quote
  #10  
Old 11-06-2003, 01:25 PM
84W123DT
Guest
 
Posts: n/a
Quote:
Originally posted by SW
FWIW, I once ran DP (method where DP is the fuel tank) and the inline filter sort of melted.
I don't think you're suppose to light it up! LOL!!!

But if you didn't, that is unusual as it had never happened to me. I keep plenty of spares at $1.50 each, it's worth having one or two in the garage.
Reply With Quote
  #11  
Old 11-07-2003, 12:11 AM
Judge's Avatar
Registered User
 
Join Date: Sep 2003
Location: San Francisco Area
Posts: 124
How would they display a restriction? and how often should they be changed?

You asked, How would they display a restriction? and how often should they be changed?

I haven't had a diesel long enough to really know, but the first of the two filters is made of clear plastic. My idea was when I see the clear filter becoming cloudy or dirty I ought to replace it.

I also thought I'd replace the first $2.00 clear filter more often then I would replace the second $10.00 screw on filter.
Reply With Quote
  #12  
Old 11-07-2003, 05:29 AM
Registered User
 
Join Date: Jan 2000
Location: PA
Posts: 5,440
Judge,

The filters "display a restriction" when the cars feels like it is driving into a head wind when going up a hill. Up until that time, the filters do not need replacement no matter how they look.

If the fuel filter in the fuel tamk is becoming restricted, it will "display being restricted" by acting like it is almost out of fuel, but actually not, when the fuel level in the tank is low and OK when the tank has more than 1/4 full.

P E H
Reply With Quote
  #13  
Old 11-13-2003, 10:44 PM
WANT '71 280SEL's Avatar
I'll Go Upside Your Head!
 
Join Date: Jan 2003
Location: Dallas, TX
Posts: 3,378
How often for the in-line filter?
Thanks
David
__________________
_____________________________________________

2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

_____________________________________________
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 03:53 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