The COMP PUMP 70 Series Electric Fuel Pump is a low volume fuel pump designed for automotive applications. The operating fuel pressure is factory set at 5-6 PSI. A fuel pressure regulator is not used. We recommend a 5/16" or larger fuel line with this fuel system. When installing the fuel pump fittings, use a thread sealant compound (you can find this at a hardware store) on the fitting threads. Do not use Teflon tape. Teflon tape can get into the Gerotor and lock the pump. Also, do not overtighten the fittings. This could damage the fuel chamber.