I went through two of those pumps ( the first one leaked ). Yes, they are 1/4" NPT in and out. Mounted mine by the gas tank and ran a 3/8" line to a single 750 Demon. At the time my small block was making about 425HP. The pump would not keep the carb full through a full 1/4 mile pass. It would run out of fuel just before the lights. Went to a Holley HP150 geroter pump and I now go through the lights with 3-4 psi ( making considerable more HP ) . Just my experience, but I will never buy another vane pump. They're for kids!