I wired my elec pump into the rear window defroster power source. It is a 25 amp circuit. The pump runs whenever the car is turned on. The defrost switch does not affect the pump. I added a toggle and in line fuse back in the tail gate too so I can turn it off if desired.

I have double fuel lines, one is a bypass, so any extra fuel pressure will loop back around and not "force" the lift pump. My elec pump set up only moves fuel to the inline filter and then back around to the tank. That way the lift pump is only "lifting" fuel about 1 foot instead of 10+ feet.

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5