What are the symptoms of a damaged high-pressure fuel pump in a car?

1 Answers
Valarie
07/29/25 3:37pm
Severe shaking, weak acceleration, unstable idle, difficulty starting, and even stalling may occur. Both the fuel pump and the high-pressure fuel pump can fail, although the probability of failure is not high. The reasons for a diesel engine's difficulty starting when hot are as follows: Clogged diesel filter: The low-pressure fuel line is blocked, causing intermittent diesel supply, the fuel transfer pump to draw air, air in the fuel line, and no fuel in the injection pump. Aging injection pump: Internal leakage in the plunger reduces fuel injection volume, delays fuel supply timing, and worsens these issues when the engine is hot. Aging fuel transfer pump: Internal leakage in the piston reduces suction and pressure capability, the check valve does not close tightly, and fuel flows back. Clogged air filter: The air filter is blocked, leading to insufficient air intake. Worn high-pressure fuel pump: Insufficient pressure due to thermal expansion, as sometimes fuel quality issues cause the pump to wear out particularly quickly.
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