Fuel injection pump

A fuel injection pump is a plunger pump that meters and pressurizes fuel oil and delivers it to the injector at the high pressure needed to atomize the charge in a diesel cylinder. In a camshaft-driven jerk-pump engine a cam lifts the plunger, and a helical edge with a spill port sets the delivered quantity and the cutoff, so the same element controls both fueling and injection timing. Marine two-stroke injection pressures run from about 800 to over 1,500 bar at the injector. Electronically controlled engines such as the MAN ME and the Sulzer RT-flex replace the cam-driven jerk pump with a common-rail accumulator and solenoid or servo valves, decoupling timing and quantity from crank angle.