It IS a bizarre setup, but I wanted 2 systems because I have never trusted the reliability of electric fuel pumps and wanted a backup, should one fail (and, it did.) There's a Holley Blue pump under the floor that I use for street (no boost) driving. There is a second filter that filters everything that comes from either tank. One filter before each pump and one after.... and I STILL got crap in my needle and seat (very fine shards of plastic.)