Abstract: A fuel delivery system for a vehicle engine and a method are provided. A first valve in parallel with a first fuel pump fluidly couples a fuel line to a fuel tank. A second valve in parallel with a second fuel pump fluidly couples a fuel rail to the fuel line. A controller opens the first and second valves during a vehicle key-off state to relieve pressure in the fuel rail and drain fuel into the fuel tank. A vehicle is provided with a fuel tank, and a valve fluidly coupling a fuel rail and a fuel tank. A controller opens the valve during a vehicle key-off state to drain fuel from the fuel rail into the fuel tank and relieve pressure in the fuel rail, and closes the valve in response to a predicted key-on event during the vehicle key-off state.

Abstract: Methods and systems are provided for a fuel tank comprising a scavenge pump. In one example, a system may include arranging a scavenge pump adjacent to a scavenge inlet, distal to a primary fuel delivery module. The arrangement may allow positive pressure from a fuel pump to force fuel back to the primary fuel delivery module during some vehicle conditions.

Abstract: Methods and systems are provided for a fuel tank comprising a scavenge pump. In one example, a system may include arranging a scavenge pump adjacent to a scavenge inlet, distal to a primary fuel delivery module. The arrangement may allow positive pressure from a fuel pump to force fuel back to the primary fuel delivery module during some vehicle conditions.

Abstract: A rotary heat engine has a cylindrical engine block containing a rotor with four equally spaced pistons and corresponding cylinders extending radially in the rotor. The pistons are pivotally connected to connecting rods that are in turn connected to a shaft at an inner end of each connecting rod. The engine block has a cover thereon and the block can have heating and cooling locations that create heating and cooling chambers within the rotor, thereby causing the pistons to reciprocate and causing the rotor to rotate within the engine block. The pistons reciprocate within the rotor while the rotor rotates within the engine block.

Abstract: A rotary heat engine has a cylindrical engine block containing a rotor with four equally spaced pistons and corresponding cylinders extending radially in the rotor. The pistons are pivotally connected to connecting rods that are in turn connected to a shaft at an inner end of each connecting rod. The engine block has a cover thereon and the block can have heating and cooling locations that create heating and cooling chambers within the rotor, thereby causing the pistons to reciprocate and causing the rotor to rotate within the engine block. The pistons reciprocate within the rotor while the rotor rotates within the engine block.