What is a Fuel Pump?
1 Answers
A fuel pump is a lightweight and compact pump, mainly categorized into three types: in-line, distributor, and unit pumps. It requires a power source to operate, with the camshaft at its lower part driven by the engine crankshaft gear. The fuel pump features an aluminum alloy housing and a movable molded component inside it. Here is more detailed information about fuel pumps: 1. The plunger is the key component of the injection pump: To draw an analogy with a common medical syringe, the movable plunger is equivalent to the syringe's piston, and the syringe barrel is like the plunger sleeve. If a spring is installed inside the barrel pushing against one end of the plunger while the other end contacts the camshaft, the plunger moves up and down once within the sleeve for every full rotation of the camshaft. This is the basic operational mechanism of the injection pump plunger. 2. The plunger and plunger sleeve form a highly precise matched pair: The plunger has an inclined groove, and the sleeve features a small hole called the suction port, which is filled with diesel. When the plunger's groove aligns with the suction port, diesel flows into the sleeve. As the camshaft lifts the plunger to a certain height, the groove and port misalign, sealing the port and trapping the diesel. Further upward movement pressurizes the diesel until it overcomes the check valve's resistance, forcing the diesel through the injector nozzle into the combustion chamber.
