The fuel system stores, filters and supplies fuel to the engine. A problem between the tank and the metering components can affect starting and operation under load even when an individual unit is sound. This category considers fuel delivery as a connected process involving lines, filters, joints and controls.
Checks are selected for the engine type and the conditions behind the complaint. Contamination or leakage needs to be distinguished from inadequate supply and regulation faults. Consumable maintenance and repair of a confirmed defect have different justifications and are agreed separately. Specialist diesel injector and pump work has its own catalogue area; here we explain how those units relate to the rest of the fuel system.