Fuel injection system for engine

A fuel injection system for an engine comprising:

• a plurality of bottom-feed type fuel injection valve assemblies each having an outer casing and an injector main body which is accommodated in the outer casing and is electrically operated, the outer casing being provided with a fuel inlet and a fuel outlet in communication with each other;
• a fuel supply pipe connected to the fuel inlet of the upstreammost fuel injection valve assembly;
• a fuel return pipe connected to the fuel outlet of the downstreammost fuel injection valve assembly;
• a plurality of connection pipes each connecting the fuel outlet of each injection valve assembly to the fuel inlet of the next fuel injection valve assembly, said connection pipes being disposed in a plane closer to an injection nozzle portion of the main body than an upper portion of the outer casing;
• and
• a harness member through which a wire harness for supplying power to the injector main body extends and which has a plurality of valve holders, each being formed integrally with the harness member and fixed to the upper portion of the outer casing by a fastener means;
• wherein said fastener means is connected in a region between said connection pipes and the upper portion of the outer casing so that said fastener means may be fastened or loosened without affecting the connection pipes.