The fuel tank is mounted below the vehicle under the trunk area or rear seat area. The tank on the E30 and E36 models is mounted to the underside of the body beneath the rear seat bottom and is divided into two sections to allow clearance for the driveshaft. Fuel is transferred from one side to the fuel pump side by a jet action pump. Fuel being returned by the fuel pressure regulator draws the fuel from the left side of the tank through an orifice, using a venturi effect, so no mechanical pump is necessary. The fuel is directed to the right side tank and is picked up by the electrical fuel pump.