Quote:
Originally Posted by sgnimj96
If I installed a 2 or 5 micron fuel filter inline with the 10 micron OEM filter on a 1985 300td , would that be too much resistance for the fuel pump to operate normally?
I was thinking I could just change out the 2 micron filter regularly and the OEM filter every once in while, plus if my fine filter plugged up on the road I could easily bypass it.
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As has already been said here, fitting a 2µ filter anywhere on the suction side of the lift pump or before the main filter makes no sense for a number of reasons. A fine filter works better and lasts longer with pressure rather than suction and replacement filter elements are not cheap @ +/- $45.
There is a bewildering variety of filter options in the Racor (and other) catalogues! I have always used a Racor R26S 2µ filter with screw on plastic bowl and water drain on these cars (i.e. the 225 R assy. 30 gal/hr). This is also a good choice for engines fitted with lift pumps that have no hand primer as the Racor 225R has a hand primer pump and bleed screw built into the mounting bracket.
I fitted one of these when my car was new between the main filter and fuel pump and has now nearly 900,000km. When I was running on Diesel I changed it every 2 years but since I started running on Jet-A1 15 years ago I have only needed to change the element once.
The initial cost is expensive and whether it is an economical proposition so late in the life of these old cars is probably questionable. Many of these cars have achieved very high mileage’s without them.