Provided is a gas fuel piping system in which even if pipes for supplying gas fuel and the like are damaged, leakage of the gas fuel, etc., into the engine room can be reliably prevented, and the pipes and the like can be easily and reliably inspected.
The present invention provides a gas fuel piping system 10 for supplying gas fuel to a diesel engine 3 comprising a supply pipe 31 and a vent pipe 32, each of which has a double-pipe structure, the gas fuel piping system 10 comprising a supply pipeline 21 for sending the gas fuel to the diesel engine 3, a vent pipeline 22 for sending vent gas from the diesel engine 3, a first duct 26 covering the supply pipeline 21 in an engine room 2, and a second duct 27 covering the vent pipeline 22 in the engine room 2. A supply outer pipe 312 of the supply pipe 31, and a vent outer pipe 322 of the vent pipe 32 extend to the inside of the first duct 26 or the second duct 27, and the end of the supply outer pipe 312 is provided with a rupture disk 40 in the first duct 26 or the second duct 27.