: Driven by the engine's camshaft, the plunger moves upward. Once it covers the barrel ports, the trapped fuel begins to compress.
: 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
If you'd like to explore a specific part of the system further, I can help you with: A deeper look at the and how it meters fuel. Comparing mechanical governors vs. electronic ECU control. : Driven by the engine's camshaft, the plunger moves upward
: Uses a single pumping element and a rotor to distribute fuel to all cylinders in sequence, typically found in smaller vehicles. If you'd like to explore a specific part
: When the pressure is high enough to overcome the spring force of the delivery valve , it snaps open, sending a high-pressure pulse of fuel through the lines to the injectors.