What is the function of a high-pressure fuel pump?
2 Answers
The function of a high-pressure fuel pump is to: increase fuel pressure, enable high-pressure injection, and achieve atomization effects. The main purpose of a high-pressure fuel pump is to serve as a power source for hydraulic devices such as jacks, heading machines, extruders, and cotton gins. The working principle of a high-pressure fuel pump consists of three stages: suction stroke, return stroke, and pumping stroke. Below is a related introduction to the working principle of a high-pressure fuel pump: 1. Suction stroke: During the suction process, the downward movement of the pump piston provides the suction force, while the intake valve opens, allowing fuel to be drawn into the pump chamber. In the final third of the pump piston's stroke, the fuel pressure regulator is energized, keeping the intake valve open during the initial upward movement of the pump piston to allow fuel return. 2. Return stroke: To control the actual fuel supply, the intake valve remains open during the initial upward movement of the pump piston, and excess fuel is pushed back to the low-pressure side by the pump piston. The pressure accumulator absorbs the pressure fluctuations generated during this process. 3. Pumping stroke: At the beginning of the pumping stroke, the fuel pressure regulator is de-energized, causing the intake valve to close under the combined action of the rising pressure in the pump chamber and the closing spring inside the valve. The upward movement of the pump piston creates pressure in the pump chamber, and when this pressure exceeds that in the fuel rail, the outlet valve opens, allowing fuel to be pumped into the fuel rail.
I've driven several cars before. Last time when the high-pressure pump failed, the engine suddenly became sluggish, as if it hadn't been fed enough. The main function of the high-pressure fuel pump is to pressurize and draw fuel from the tank to the engine injectors. Under high pressure, the injected fuel atomizes finely and evenly, resulting in more complete combustion, stronger power, and significantly better fuel efficiency. Modern direct injection engines rely heavily on it to enhance performance. I always choose premium-grade fuel because low-quality fuel can corrode the internal components of the pump, accelerating wear and leading to issues like shaking and oil leaks. During regular maintenance, listening to the pump's operating sound is crucial. A normal sound should be smooth; if there are any unusual noises or loud sounds, it's essential to replace or repair it promptly to avoid breaking down on the road and incurring costly towing fees.
