Fuel is routed from the fuel cell through 1/2-inch Earl's Super Stock fuel line. It necks down to 3/8-inch line at the fuel pump outlet. Always run a filter before and after an externally-mounted fuel pump on fuel-injected engines. This helps keep your fuel pump alive and ensures that debris will stay out of the expensive injectors. A 3/8-inch return line completes the system. The fuel lines and wiring are secured up high and out of harm and heat's way.