PURPOSE: To shorten the full length of an engine so as to miniaturize it by providing a delivery pipe and a pressure regulator on one cylinder bank side, and providing an intake pipe so as to bend toward the other cylinder bank side.

CONSTITUTION: A delivery pipe 26 to distribute fuel to respective cylinders of an engine to which an air cleaner A is connected through a throttle body 12 and an intake pipe is provided. The delivery pipe 26-1 of the projecting side of the first and the second cylinder banks 4-1, 4-2 is provided to be extended. Further, a pressure regulator 28 to adjust injection pressure from a fuel injection valve is provided in the vicinity of the one side of the delivery pipe 26-1. The intake pipe 24 is provided to be bent toward the other cylinder bank side. Hereby, the part generated by deviation of the first and the second cylinder banks 4-1, 4-2 is utilized so as to miniaturize the engine.