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Originally Posted by OM617YOTA
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Racor makes a wide variety of water separator/filters. I used one on my Perkins-Vega swap years ago when I was burning the Mexican fuel ($0.18 per gallon) that was brown and milky with crud. Worked quite well.
At the other end of the spectrum, I'm pushing 50k miles on my prefilter and spin on filter on the SL - obviously pretty careful where I fuel up...it makes a difference.
You could also hook up a simple aux filter assembly using a remote oil filter housing and cheap PH8A filters and run that in series with a water separator. I might be inclined to include an electric boost pump which was dash operated for when the filters started to get clogged and the lift pump was having trouble, just to prevent getting stranded before being able to swap the filters.
In another application I used two tanks. I would fill the 80 gallon tank with fuel then pump it into the regular tank through a PH8A filter using an electric fuel pump to get out the big hunks and then use the polished fuel to feed the engine through the regular filters.