Patent ID: 7013869

Claim:
A fuel supply system for an internal combustion engine comprising: an air intake pipe for taking in air; a throttle valve disposed in said air intake pipe for controlling an amount of said air; a downstream fuel injection valve located near an air intake port of a cylinder of an internal combustion engine or inside a cylinder; a bypass air intake passage for bypassing said throttle valve located upstream of said downstream fuel injection valve; a fuel vaporizing section including an upstream fuel injection valve connected to said bypass air intake passage; and a heater for vaporizing fuel injected from said upstream fuel injection valve; said bypass air intake passage having a vaporized-fuel branch section for channeling said vaporized fuel to said each cylinder, and a vaporized-fuel distribution passage extending from said vaporized-fuel branch section to an opening located in each air intake pipe located downstream of said throttle valve, wherein concerning the length of said bypass air intake passage, the shortest passage between those cylinders that have overlapping air intake timing is longer than the shortest passage between those cylinders that do not have overlapping air intake timing.