Fuel Boost Pumps

An electric motor-driven fuel boost pump is mounted into the bottom of each fuel cell, to deliver fuel at a rate up to 990 pounds per hour at 5 to 30 psi pressure. Each pump is submerged in fuel, with it's outlet connected to a hose leading to an external fuel line. Electrical leads and a sealed drain line are provided on the lower exterior face of the pump. 

The pumps deliver fuel to a fuel manifold. Two fuel pressure switches are installed to illuminate the FWD FUEL BOOST or AFT BOOST lights, when boost pump pressure drops below rated pressure. Fuel from the manifold passes through an electrically operated fuel shut- off valve to a fuel filter. Fuel is then routed to the engine. Thermal relief valves allow fuel to return from the engine to the fuel cells after engine shutdown.