Patent ID: 8109137

Claim:
A device for detecting cam top position of an in-line type high pressure pump having a camshaft for driving a plurality of plungers to pressurize fuel to a high pressure to be accumulated in an accumulator, the device comprising: a plurality of cams formed on the camshaft for driving the plurality of plungers; a plurality of cam lobes provided to each of the plurality of cams; a flywheel provided to the camshaft; and a plurality of cam top position pointers attached to an outer periphery of the camshaft or to an outer periphery of the flywheel, wherein the plurality of cam top position pointers correspond to the cam lobes of one of the plurality of cams in number and angle phase, and a cam top position detector is located to face the cam top position pointers when the camshaft rotates so that the cam top position pointers are detected by the cam top position detector.