ISM, ISMe, and QSM11 – 005-999   Fuel System – Overview

Installation Publications

The following publications are available to provide fuel system installation recommendations approved by Cummins Inc.:

Automotive Installation Recommendations (Fuel System), Bulletin 3382707.

Contact the nearest Cummins® Authorized Repair Location for engine fuel system specifications and requirements provided on the Engine Data Sheet for your specific engine and application.

Overhead Fuel Tank Requirements

If the fuel filter is lower than the fuel pump, install a check valve in the filter outlet fuel line. See the Installation Recommendations Bulletin 3382015.

The check valve on the outlet side of the fuel filter prevents gear pump fuel drainback during filter removal.

Install a shutoff valve between the filter and the fuel tank.

WARNING  Fuel is flammable. Keep all cigarettes, flames, pilot lights, arcing equipment, and switches out of the work area and areas sharing ventilation to reduce the possibility of severe personal injury or death when working on the fuel system.

If the fuel line valve is not used, the overhead tank can drain when the fuel filter is changed. Spilled fuel is a fire hazard.

Proper Use of Fuel System Gauges

To be sure the reading is correct, always remove the air from the pressure gauge line before taking a reading.

Loosen the connection at the gauge to remove the air.

Do not loosen the vacuum gauge connections when the engine is operating.

Read the gauge in direct alignment with the gauge hand.

Read the flow meter in direct alignment with the float.

Read the level of the floats where indicated.

Portable fuel pressure gauges must be checked regularly against a reference gauge or against the gauge on the fuel pump test stand. Adjust the valve on the gauge until the gauge needle stops vibrating.

When measuring the fuel inlet and drain line restriction, the manometer or gauges must be on the same level as the connection point.

Always use the same size and material of line or hoses as was originally supplied with the gauge.

The distance from the gauge to the connection point must be as short as possible.