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.
The difference between and indirect injection nozzles. Fuel Injection pump working principle - Animation
: 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. The primary working principle of a fuel injection
: Uses a single pumping element and a rotor to distribute fuel to all cylinders in sequence, typically found in smaller vehicles. typically found in smaller vehicles.