Fuel Injection Pump Working Principle - Animation Official

: When you press the accelerator, a control rack rotates the plunger. This changes the position of the helix, determining how long the spill port stays covered and, consequently, how much fuel is delivered to the cylinder. Common Pump Types in Animations

: As the plunger reaches the bottom of its stroke, fuel from the supply tank floods the barrel through inlet ports . Fuel Injection pump working principle - Animation

: To stop injection, a helical groove on the plunger eventually uncovers a spill port . This allows pressurized fuel to "spill" back into the lower-pressure gallery, causing the delivery valve to close instantly. : When you press the accelerator, a control

: Features individual plunger units for each engine cylinder, common in larger diesel engines. : To stop injection, a helical groove on

: In modern systems, an Electronic Control Unit (ECU) uses signals to trigger high-pressure solenoid valves , replacing the mechanical rack and governor for more precise control.

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