What Causes Oil Leakage in the Corolla High-Pressure Fuel Pump?

[DelSophie]

Regarding the causes of oil leakage in the Corolla high-pressure fuel pump, the following factors are involved: Component Damage: The oil seal on the hydraulic pump spindle is damaged, or the spindle has defects or scratches; excessive internal leakage increases pressure at the oil seal, leading to damage or displacement of the seal; the drain pipe is too thin or too long, causing leakage at the seal. Solution: Repair or replace the damaged components. Seal Aging: Oil leakage is mainly concentrated at the timing cover position, caused by loose external oil pipes on the hydraulic pump of the crankshaft position sensor, damaged pipe joints, or aged or cracked sealing gaskets. Solution: Replace the sealing ring on the crankshaft position sensor.