Quote:
Originally Posted by layback40
I cant see the logic in placing a finer filter upstream.
If this new filter is filtering down to say 2 micron, nothing is likely to catch on the 10 micron. It is normal to have filters finer as you go.
Using that principle, one would place the 2 micron after the secondary filter, before the IP. This would maximize the life of both filters & minimize plugging of the 2 micron. That is what is done with large diesels in earth moving applications.
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You are very correct, the finner filtration should be at each step down stream. when i got the car 2 yrs ago, the Racor was not hooked up, and looked like it was a looooog time since it ever was. they had the little plastic one in line. so I took the Racor apart and cleaned it up. the old fuel looked like dirty engine oil.
Reinstalled the assembly, and adden new hoses. then bought a new filter element at West Marine. they only had the 2 micron. I think they only come in a 2, 10 and 15 micron.
I have come across several older 240D, 300D and 300SD`s with these filters installed. I was talking to a retired MB mechanic, and he stated back when the increase of Diesel vehicles started arriving back in the early 80`s or when ever it was, the majority of service stations only carried gasoline and not diesel. so when stations started converting some of their tanks to diesel, MB had a lot of problems with people coming in with fuel related problems. so the racor`s were added.
Now I could splice into the line running from the secondary to the IP, and run it through the Racor and then to the IP. then add the little plastic prefilter back in line.
Charlie