what 12v electric inline fuel pump do you recommend to pump 70/30 wmo rug or 80/20 wmo rug from the wmo tank in the trunk compartment of a 1990 corolla to the fuel filter in the engine compartment ? i have 2 3 way ball valves with a dual tank system. if i install a 12 v inline auxilary fuel pump near the wmo tank to help move the oil to the filter, is this pump always on, even when i switch to thr diesel tank? or would a switch be best to only turn the aux pump on when i switch to wmo?