I bought my first Carter fuel pump in 1990. About 1996 I bought a new one and I am using the old one as a spare as I go Jeep'n in the back country. The power should connect thru the oil pressure switch so in case of accident or rollover it will stop pumping gas. There are also after market devices that will turn the pump on for a few seconds to pump gas to carburetor as soon as you turn on switch. Because the pump pulls fuel thru the fuel filter (filter a must), the fuel filter needs to be replaced about twice as often as the one mounted after the old mechanical pump. As the mechanical pump causes vapor lock it needs to be bypassed. I believe some of the bad reviews could be because of these issues.