Aeromotive makes what you are looking for. Not exactly cheap but hits exactly what you asked for http://www.summitracing.com/search/D...r/?Ns=Rank|Asc
Mallory makes some similar ones, but in the 40 micron size they recommend for their gerotor pumps. Rotory vane pumps can use the looser 100 micron.
I don't know if relying on a filter as a sump will work. You would still need some way of getting any trapped air out of the filter. Once it is in there, the only place left for it to go is out through the pump.
I saw an article in Car Craft for a fuel pick up screen that is suppose to act like a fuel sump. The ad looks pretty promising. Looks like it would work as a filter too. http://www.autoperformanceengineerin...l/pickups.html