fuel supply unit

Abstract

This suppresses vaporization of the return fuel when a portion of the fuel is relieved after it has been pressurized by the fuel pump. [Solution] The fuel supply device 10, which supplies high-pressure gaseous fuel stored in the fuel tank 12 to the engine 50, comprises a fuel pump 20, a discharge fuel passage 40 connecting the fuel pump 20 and the engine 50, a relief passage 42 branching off from the discharge fuel passage 40 and joining to the pump chamber of the fuel pump 20, and a relief valve 46 provided in the relief passage 42 that opens when the fuel pressure in the discharge fuel passage 40 exceeds a predetermined pressure.

Claims

1. A fuel supply device that supplies high-pressure gaseous fuel stored in a fuel tank to a fuel supply destination, Fuel pump and A discharge fuel passage connecting the fuel pump and the fuel supply destination, A fuel return passage that branches off from the aforementioned fuel discharge passage and merges with the pump chamber of the fuel pump, A relief valve provided in the fuel return passage and which opens when the fuel pressure in the discharge fuel passage exceeds a predetermined pressure, A fuel supply device equipped with the following features.

2. A fuel supply device according to claim 1, The aforementioned pump chamber is formed by a pump body and a pump cover. A fuel supply device wherein the pump cover has a downstream end passage for the fuel return passage formed therein.

3. A fuel supply device according to claim 1, The aforementioned pump chamber is formed by a pump body and a pump cover. A fuel supply device in which the pump cover has the fuel return passage formed therein and the relief valve built in.

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