Nugen S10KS, Operator'S Maintenance Manual

Page: 43 / 64

OPERATOR & MAINTENANCE MANUAL
PAGE ‐ 39
Fuel from the tank flows in the fuel lines and is injected from the nozzle via the fuel injection
pump. Overflow fuel returns to the tank. The system includes filters to protect it from
entrance of air, water and dust. While the engine is running, fuel is fed into the pump by the
fuel feed pump after passing through the fuel filter where any foreign matter is removed.
The fuel camshaft actuates the injection pump and force feeds fuel to the injection nozzle
through the injection pipe. Fuel is then sprayed through the nozzle into the combustion
chamber. The fuel discharged after lubricating and cooling the injection nozzle is returned to
the fuel tank through the over ‐ flow pipe.
Base Tank
Base mounted fuel tanks are used to store fuel directly underneath the Genset, eliminating
the need for a remote main fuel supply tank and/or auxiliary fuel transfer pumps. This
mounting arrangement offers the convenience of having a fuel supply tank mounted at the
generator. These tanks are designed to be contained in a rectangular base on which the
engine ‐ generator set is mounted. Generally, these tanks only increase the height of the
generator set since the tank base is usually matched to the generator skid dimension.
Remote tank
Remote tanks are used when the engine fuel pump does not have the capacity to draw the
fuel from the base tank; or the base tank is overhead and presents problems of high fuel
head pressure for the system. In high ambient conditions, the day tank temperature might
need to be considered. Warm fuel returning from the engine fuel injection pump should not
be returned to the day tank if possible. As fuel temperature increases, fuel density and
viscosity decrease, reducing maximum power output and lubrication of fuel handling parts
such as pumps and injectors. This may be avoided by returning the fuel back to the supply
tank rather than the day tank.
Engines need to maintain some of the oil pump pressure and return oil pressure when the
engine is working. When using a remote fuel tank, the height difference between the pump