CARTER use rotating vane technology in their electric fuel pumps. They have an internal pressure-regulating valve, and feature free-flow fuel delivery. These pumps have no points to burn out, and no shaft seals to leak or deteriorate. Easy to install, these universal fuel pumps come with a complete installation package and instructions. 2 options available rated at 4.5psi to 8psi or 9.5psi to 16psi. 3/8npt female inlet and outport ports. Suitable for Petrol and Diesel. Runs off 12V. (Fuel lube mixes in with fuel)