Pump is rated at 6-9 PSI & 35-45 GPH and are self priming. Inlet and outlet ports are 1/4" NPT and 1/4" hose barb fittings are included. This pump is compatible with petrol, diesel, fuel additives, bio diesel, blended alcohol fuels and racing fuel octane booster additives. No regulator is required with this pump. Not for use with fuel injection.