What faults will occur if the fuel pump pressure is insufficient?

[HaileyAnn]

Insufficient fuel pressure will cause the vehicle to lack power during acceleration or even shake and stall. Additionally, if the fuel pressure cannot be maintained, it may result in the engine failing to start on the first attempt. The fuel pump requires a power source to operate, and its lower camshaft is driven by the engine crankshaft gear. The main reasons for insufficient fuel pump pressure include: 1. Wear of the oil seal at the rear end of the pump drive gear shaft or loose pipeline connections, allowing air into the system; low fuel level in the tank, or a dirty filter; 2. Wear or jamming of the pump gear end face bearing, causing excessive axial clearance of the pump gear; 3. Damage to the needle bearing, leading to abnormal meshing of the pump gears and scoring of the pump housing inner cavity.