Overview: this upgrade addresses the concern some have over the absence of a fuel/water separator in 123s, and adds an excellent pre-filter that should increase both the final filter’s efficiency and life.

Top View (install details follow):


Parts:
Stanadyne FM100 30 micron pre-filter water seperator assembly (3/8" NPT ports)
go to www.reliableindustries.com or call 800-693-4583, order part#33641 - LINK for a measely $32.68

other parts you'll need:

• ~4' 5/16 fuel hose
• 2 hose clamps
• brass fittings: 2x - bushings 3/8 to 1/8, 2x - 3/8 plugs, 2x - 1/8 street elbows, 2x - 1/8 to 5/16 hose
• teflon tape
• stainless steel mounting hardware: 2x - 5/16x1-1/4" bolts, 4x - flat washers, 2x - 5/16 nuts, 2x - 5/16 self-locking nuts

the install:
1. assemble all brass fittings on the filter head.

2. attach the short section of hose to the intake and the in-line pre-filter

3. mount filter
drill 2 5/16" holes
insert 1-1/4 bolts from the back, put a little permanent locktite (red) on the first 1/4 inch of exposed threads, then tighten down nuts over the locktite against the sheetmetal (this creates your filter mounting posts), then add flat washers, filter head, flat washers, self-locking nuts



4. attach remaining fuel hoses

5. pre-fill FM100 with a good fuel additive (unscrew large black filter assembly cap by hand and pour additive in).

6. prime system with OEM hand pump

7. drive - you're done!

additional images:


in-line's already catching crud:


Clear Bowl Water Reservior Option:
you can see in the pics that i have an additional clear bowl water reservior installed. this is an easy screw-on option - part#29899 $26.96 from reliable. i happened to have this one already, so i installed it but it's hard to view so i will probably leave it off when i replace the filter.

FM100 water removal efficiency:

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