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fass system fuel filters

how often should filters be changed with fass fuel system

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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.

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pretty cool, too laborious for me (doing that at a truck stop) but bump for you.

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i do my about every 20-25k miles.

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At 25K, I clean the fuel/water and change the fuel filter, then at 50K, I change them both. PP recommends this!

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How do you clean the fuel/water separator? Your maintenance resembles ops change intervals. I've tried going over 30k miles (3 filters x 12k miles each) but my mpg drops a bit usually over 20-25k.

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Anyone have a FASS system for sale?

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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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MRMTRANS, do you have a part# for the gaskets? and do you ever change the separater?

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I don't have part # because I've never had go bad and start sucking air. But I know NAPA has catalogue of-I'm guessing-hundreds of gaskets to order from if not stocked. I've seen catalogue. And they carry a glass fiber separator that fits FASS, so I would think they can get gasket. I've only changed separater once because pecock started to leak. I've had FASS in on truck for 110 k miles and just installed in 2nd truck 19 k miles ago. Separater should always function as long as serviced. Gas rinse periodically seems like good idea too. Separater interior is steel centrifuge as apposed to glass fiber and only needs microns dislodged to keep working.

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timjrobb will be eternally grateful.
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