How to Detect a Faulty High-Pressure Fuel Pump?

[NovaMarie]

Severe shaking, lack of acceleration power, unstable idle speed, difficulty starting, and even stalling are symptoms of a faulty high-pressure fuel pump. Below are relevant details: 1. Both the fuel pump and high-pressure fuel pump can malfunction, but the probability of failure is not high. With proper usage, they can last over 100,000 kilometers without issues. 2. A damaged fuel pump inside the fuel tank is a serious malfunction that directly affects the car's power and may even cause the vehicle to stall or fail to start. While a faulty high-pressure fuel pump won't necessarily cause the car to stall, it can lead to weak acceleration and strong jerking sensations during driving due to unstable fuel supply (some cars may illuminate the emission fault light if the high-pressure fuel pump is damaged). 3. There are multiple reasons for weak acceleration and jerking sensations, such as faulty spark plugs, carbon buildup in the throttle body, or ignition coil failure. However, if a direct-injection engine exhibits these symptoms, it is reasonable to suspect whether the high-pressure fuel pump, one of the two fuel pumps, is the issue.