What's everyone doing for fuel filtration? Prefilter after the tank, before the lift pump (LP)? Primary filter between the LP and IP? What kind of micron ratings are you using (if you know)? Pics and mfgr/part #'s would be helpful... In the plumbing dept. at work, we've got heating oil filters for home oil furnaces for like $15. Metal cap and bowl, big felt-looking filter element, 3/8" NPT fittings. They're UL-listed, so they shouldn't be unsafe. Does this sound OK to use as a pre-filter?