Fuel Injection Pump Working Principle - Animation (2026)

: Features individual plunger units for each engine cylinder, common in larger diesel engines.

The primary working principle of a fuel injection pump involves using a reciprocating inside a barrel to pressurize and meter fuel before delivering it to the engine cylinders . In a standard mechanical setup, a camshaft drives the plunger up and down, while a control rack rotates the plunger to adjust how much fuel is injected per stroke. Fuel Injection pump working principle - Animation

The difference between and indirect injection nozzles. : Features individual plunger units for each engine

: As the plunger reaches the bottom of its stroke, fuel from the supply tank floods the barrel through inlet ports . The difference between and indirect injection nozzles

: Driven by the engine's camshaft, the plunger moves upward. Once it covers the barrel ports, the trapped fuel begins to compress.