Abstract: A fuel supply device connects a fuel tank, which stores a fuel necessary for power of an engine, to a hand-operating pump inlet of the engine, connects an inlet opening of a filter can that includes the inlet opening and an outlet opening to a hand-operating pump outlet of the engine, connects the outlet opening to a slope terminal of a fuel-returning three-way pipe, connects a priority terminal of the fuel-returning three-way pipe to a fuel return port of the engine, and connects a discharge terminal of the fuel-returning three-way pipe to a high-pressure pump fuel inlet port of the engine, whereby heated fuel from the fuel return port of the engine is supplied, with priority, through the discharge terminal of the fuel-returning three-way pipe to the engine for combustion for saving energy and effectively improving operation performance of the engine.

Abstract: A nose of single-air-hole electrical arc spray machine includes a nozzle body that forms an air flow hole and two guide tube holes arranged at opposite sides of the air flow hole and forming a predetermined angle with respect thereto, a nozzle ring positioned against and fixed to the nozzle body, an electrical discharging chamber internal lid positioned against the nozzle ring, an electrical discharging chamber external cover enclosing the electrical discharging chamber internal lid, an external mounting ring mounting the electrical discharging chamber internal lid and the electrical discharging chamber external cover to the nozzle body, and wire guide tubes. Each of the wire guide tubes includes an insulation section, a conductor section, and a wire emergence terminal sequentially connected to each other. The nose is durable and is easy to maintain with a reduced maintenance cost and improves void ratio of a sprayed layer of coating formed thereby.