FUEL SUPPLY CONTROL DEVICE FOR ENGINE

PROBLEM TO BE SOLVED: To prevent the release of evaporating fuel generated in a fuel tank to the atmosphere and the deformation of the fuel tank due to reduced pressure by shutting off a fuel passage system as well as an air vent system ranging to an upper space in the fuel tank at the same time when stopping the operation of an engine. SOLUTION: A composite control valve V has a valve housing 40, a first diaphragm 41 for sectioning an atmosphere chamber 43 between the inside face thereof and itself, a second diaphragm 42 for sectioning negative pressure operation chambers 44, 45 between the first diaphragm 41 and itself, a first control valve 50 to be opened/closed with the first diaphragm 41, and a second control valve 60 to be opened /closed with the reciprocating motion of the second diaphragm 42. The first control valve 50 opens/closes an atmosphere conduit 49 ranging into the fuel tank T, at its portion open to the atmospheric chamber 43, and the second control valve 60 opens/closes the fuel passage system via which the fuel tank T is communicated with a fuel supply portion C of the engine E. A relief valve 54 to be opened during reducing pressure in the fuel tank T is provided between the atmosphere conduit 49 and the atmosphere chamber 43. COPYRIGHT: (C)2005,JPO&NCIPI