Quote:
Originally Posted by OM617YOTA
The factory prefilter might as well be chicken wire, just to keep out the big chunks. Not a set spec, and not that picky.
I only ran the factory specified prefilter part number for the first couple changes, after that I just bought whatever inline fuel filter with a visible filter element was largest/cheapest from the local auto parts or hardware store.
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The inline inlet filter on W123s is a nominal 20 micron fuel filter. The stock secondary/spin-on Fuel Filter is 10 nominal microns.
Fuel Filter issues are somewhat dictated by the quality of the Fuel. If you live someplace where fuel containation is a probem or gunk is growing in your fuel tank the situation is different.