For the high pressure fuel system, what should be inspected?

• A. Pumps and injection lines for issues.
• B. Alternator and battery.
• C. Radiator fins.
• D. Vacuum lines.

Answer: (A)

The essential focus is on the pump that pressurizes the fuel and the injection lines that carry that pressurized fuel to the injectors. If either is damaged or leaking, fuel pressure can drop or fail to reach the injectors, which can cause engine misfire, reduced performance, or a fire hazard. So, inspect the fuel pump for proper operation, signs of wear or failure, and any leaks, and scrutinize the injection lines for cracks, kinks, bulges, or loose fittings and secure connections.

The other items listed aren’t part of the high‑pressure fuel circuit: the alternator and battery are electrical power sources, radiator fins belong to the cooling system, and vacuum lines are part of the intake/ventilation systems.