one thing that you need to be aware of is that in that mode of operation you are working the diaphragm of the mech. pump harder than it was ever designed to work and a split diaph. will fill the crankcase with gasoline rather quickly. this is both bad and dangerous; bad from the standpoint of losing lubricity and wiping bearings and dangerous from the standpoint of fire. i wont even run a stock fuel pump on an engine because of this fact, all of my fuel systems are completely electric with no way to flood the crankcase with gas, ive been there and done that and cost a set of rods and mains on a 426 hemi, not again... JEFF tucson az.