Quote:
Originally Posted by babymog
The Mercedes fuel injection system already does that through the filter and fuel return lines.
If you want to filter more, change the plastic secondary filter out for a Racor 600FG or better.
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While I did mention Mercedes remember this part of the forum the Diesel Forum and I notice a lot of the members have other diesel vehicles.
What I got from the article was that by having the separate fuel filter system it helped prevent having your normal filter system get plugged up an some awkward time (or at least happening as often) and I can see the benefit of that.
Years ago when I worked in a fuel injection shop and we installed the Racor or Dhal filters (mostly on Chev 6.5 and Ford 6.9 PU trucks) it was not unusual for our customers to complain that within a day or two they were stopped dead on the road. The filters had done there job but plugged up and cut the fuel off (they had contaminated fuel in their tanks). You can drain the water out of the filter but the algae and rust stay on the filter element. (Not to mention the cost of the Racor filters.)
What I got from the article is that this was a way to deal with/reduce the specific problem of contamination in the tank before it gets to your normal fuel system and you get shutdown.