Patent ID: 7954479

Claim:
A fuel supply device for a gas engine, the fuel supply device comprising a vaporizer that gasifies a first fuel introduced from a first fuel source, a primary regulator that pressure-regulates the first fuel, which is in a gaseous state, introduced from the vaporizer, a fuel changeover valve that has a first inlet passage to which is introduced the gaseous first fuel fed out from the primary regulator, a second inlet passage to which is introduced a gaseous second fuel fed out from a second fuel source and a common outlet passage and can selectively connect the first and second inlet passages to the outlet passage, a common secondary regulator that regulates the pressure of the gaseous first fuel or second fuel fed out from the outlet passage of the fuel changeover valve so as to be at substantially atmospheric pressure and supplies the fuel to a mixer of a gas engine, and a cutoff valve that opens/closes a fuel passage between the fuel changeover valve and the secondary regulator in response to operation/stopping of the gas engine, the vaporizer, the primary regulator, the fuel changeover valve, the cutoff valve, and the secondary regulator being integrally connected to each other to form a unit.