I have had Stewart Warner electric fuel pumps on my cars for over 12 years and never any problems. They make a 6 volt and a 12 volt pump, no return lines. I have a pressure regulator on the 57 but it probably doesn't need one. No pressure regulator on the 34 Plymouth. Pressure max is about 7 psi, and the regulator on the 57 is set for about 5 psi.

Just to be safe I do carry a spare pump in case one would fail but only because of the age of the pumps, not the quality of the units.