fass system fuel filters
how often should filters be changed with fass fuel system
Is this a good question?
Jerzy, I remove the separator and empty the fuel, then pour it full of gasoline and shake and dump and then repeat until I can see no residue in the cannister, if it is clean I fill with fuel and reinstall but if there is gunky looky stuff, I replace it.
FASS recommends "cleaning" separater every 250 gallons, by loosening filter, shake to dislodge fine particles, then drain. I do when I fuel, and drain into gallon container and use for reefer fuel-it is mostly clean if done at recommended interval. Separater will last as long as gasket and drain pecock, so don't overtighten either. Replacement gaskets can be purchased at NAPA. Fuel filter has always gone at least 30 k miles on my trucks. Install a fuel pressure guage ($20) at the port on FASS drilled for this purpose, and carry spare filters; you then can push the filter change to the limit. I have gone 65 k before filter clogged and pressure read below 7 lb.
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