I found out when trying to replace and relocate the stock carter lift pump with a carter hi perf one meant for gas motors that the factory pump runs at around 9 volts, where the hi perf one runs at 12. My aftermarket pump would not run; had to get one made especially for the cummins. Best thing to do is to move the pump either real close to the tank or install one in the tank. The lift pumps, like any pump on a drag car, work better pushing, rather than pulling fuel. The shorter the distance they have to pull the fuel the longer they live.