Product Manual

4. Installation2-2017

If the fuel inlet restriction exceeds the defined limit due to the distance/customer-

supplied plumbing between the generator set and the main fuel tank, a transfer tank

(sometimes referred to as a day tank) and auxiliary pump will also be required. If an

overhead main fuel tank is installed, a transfer tank and float valve will be required

to prevent fuel head pressures from being placed on the fuel system components.

Fuel Inlet Pressure/Restriction Limit

Engine performance and fuel system durability is compromised if the fuel inlet

pressure or restriction limits are not adhered to. Fuel inlet pressure or restriction

must not exceed the limits stated in the model-specific generator set Specification

Sheet.

Day Tank

Some generator set installations may include a fuel day tank. They are used when

fuel inlet restriction limits cannot be met, or the supply tank is overhead and

presents problems of high fuel head pressure for the fuel inlet and return lines.

Supply Tank Lower Than Engine

WARNING

Fuel spillage.

Spilled fuel presents the hazard of fire or explosion which can result in

severe personal injury or death.

Provide an overflow line to the supply tank from the day tank.

NOTICE

The supply tank top must be below the day tank top to prevent

siphoning from the fuel supply to the day tank.

With this installation, the day tank is installed near the generator set, below

the fuel injection system and within the fuel inlet restriction limit. Install a fuel

transfer pump, to pump fuel from the supply tank to the day tank. A float

switch in the day tank controls operation of the auxiliary fuel pump.

Provide a return line from the engine injection system return connection to the

day tank. Plumb the return line to the bottom of day tank. Provide a day tank

overflow line to the supply tank in case the float switch fails to shut off the fuel

transfer pump.

Supply Tank Higher Than Engine

With this installation, the day tank is installed near the generator set, above

the fuel injection system and within the fuel return restriction limit. Include an

automatic fuel shutoff valve in the fuel line between the fuel supply tank and

the day tank to stop fuel flow when the generator set is off.

Provide a return line from the engine injection system return connection to the

day tank. Plumb the return line to the bottom of day tank.