PURPOSE: To provide a fuel supply device with which the fuel is prevented from turning into high temp. and which presents effective cooling of component parts such as a fuel delivery pipe, etc.

CONSTITUTION: When an internal combustion engine is at a high temp., the first pressure changeover valve is operated for applying the suction pipe pressure on the first fuel pressure adjusting valve 14 while the second pressure changeover valve 74 is operated so that the second fuel pressure adjusting valve 20 is released to the atmosphere, and in cases other than high temp. with the engine, the first pressure changeover valve is operated so that, the first fuel pressure adjusting valve 14 is released to the atmosphere. A control means 78 is furnished to control the operation of the second pressure changeover valve 74 for applying the suction pipe pressure on the second fuel pressure adjusting valve 20.