What are the symptoms of insufficient fuel pump pressure?

[Reginald]

Symptoms of insufficient fuel pump pressure: 1. Abnormal noise from the fuel pump under the rear seat while driving; 2. Weak vehicle acceleration, especially noticeable jerking during sudden acceleration; 3. Difficulty starting the vehicle or failure to start; 4. The engine warning light on the instrument cluster remains illuminated. The normal operating range for a fuel pump is: 1. Approximately 0.3MPa when the ignition is turned on without starting the engine; 2. Approximately 0.25MPa at idle speed after starting the engine. The fuel pump is a fundamental component of the engine's fuel supply system.