Most diesel engines need a cold starting aid. In some cases extra fuel is injected directly into the combustion chamber, which has the effect of…

Injectors work like a relief valve. The internal piston is spring loaded, remaining closed as pressure builds and opening when the set pressure (break setting)…

Fuel is considered to be incompressible. When it is pumped into a closed system the pressure rises rapidly until the break setting of the injector…

After changing the filter element, the fuel system must be bled to remove any air. First identify, then open the bleed screw on the filter…

The final line of defence for the high pressure pump is the fine filter, which traps any debris before it can clog either pump or…

This is operated continuously from a cam on the engine camshaft. It provides a constant supply of fuel at low pressure to the high pressure…

Water may pass through fine filters, so most systems have a separate water trap in which water can settle out of the fuel and be…

Engines vibrate relative to the boat, and therefore a fuel system made entirely of solid pipe would soon fracture. Part of the pipework between the…

This should ideally be above the engine level where the head of fuel will provide a positive pressure throughout the fuel system. Any leaks will…

The diesel is the simplest of all engines, which is one of the main reasons for its reputation as the most reliable power source for…