Update your semi with a key device that provides a seamless transfer of diesel fuel, with the Tuthill Transfer 12V Diesel Only Transfer Pump Kit, ensuring you're Ready for the Road Ahead™. Thanks to its heavy duty construction , this replacement pump is the ideal option to fill fuel tanks in a variety of environments. . Engineered with rotary vane technolgoy for consistent flow performance. FleetPride is your First Click in Heavy Duty®.