How to Determine if a High-Pressure Fuel Pump is Good or Bad?

[Diana]

To determine if a high-pressure fuel pump is good or bad, observe the following symptoms: severe vehicle shaking, weak acceleration, unstable idle, difficulty starting, or engine stalling, which indicate a damaged high-pressure fuel pump. The functions of a high-pressure fuel pump are: 1. It increases fuel pressure to ensure complete combustion; 2. It enables high-pressure injection for optimal atomization; 3. It serves as a power source for hydraulic devices such as jacks, headers, extruders, and cotton gins. Causes of high-pressure fuel pump damage include: 1. Improper refueling practices; 2. Avoid waiting until the fuel warning light comes on before refueling, as this shortens the pump's lifespan; 3. Running the fuel tank too low or completely out of fuel can burn out or damage the pump; 4. Overfilling the fuel tank.