Product Manual

4. Installation2-2017

4.2 Fuel System

NOTICE

The factory-installed sub-base fuel tanks meet the fuel system requirements.

Please verify that they also meet local codes and standards.

Cummins engines normally use a diesel fuel specified to ASTM D975 grade 2.

Refer to the Engine Operator Manual for additional information.

In all fuel system installations, cleanliness is of the utmost importance. Make every

effort to prevent entrance of moisture, dirt, or contaminants of any kind into the fuel

system. Clean all fuel system components before installing.

NOTICE

A fuel filter/strainer/water separator of 100-120 mesh or equivalent

(approximately 150 microns nominal) must be fitted between the main tank

and day tank if a factory sub-base tank is used as a day tank.

Use only compatible metal fuel lines to avoid electrolysis when fuel lines must be

buried. Buried fuel lines must be protected from corroding.

NOTICE

Never use galvanized or copper fuel lines, fittings, or fuel tanks.

Condensation in the tank and lines combines with the sulfur in diesel fuel to

produce sulfuric acid. The molecular structure of the copper or galvanized

lines or tanks reacts with the acid and contaminates the fuel, resulting in

possible engine damage.

An electric solenoid valve in the supply line is recommended for all installations and

required for indoor automatic or remote starting installations that do not use the

factory sub-base fuel tank. Connect the solenoid wires to the generator set

“Switched B+” circuit to open the valve during generator set operation.

NOTICE

Never install a shutoff device in fuel return line(s). If the fuel return line(s) is

blocked or exceeds fuel restriction limit, engine damage will occur.

NOTICE

A base mounted fuel tank may be part of the generator set build. An

additional external fuel system may be required if the onboard fuel capacity

is not sufficient for the application.

Fuel Selection and Recommendations

For fuel specifications, see the Model Specifications section.