Mechanical Fuel Pumps: Description

Mechanical fuel pumps are either component or sealed unit design and some incorporate a vacuum pump (for vacuum operated windshield wipers). All fuel pumps are diaphragm operated single action pumps, actuated by a rod and/or rocker arm engaging an eccentric on the engine camshaft. On combination fuel/vacuum pumps, the vacuum pump is piston type and actuated by the same rod and/or rocker arm as the fuel pump.