Fuel System General Information
The PT fuel system is used exclusively on Cummins Diesels. The identifying letters, ‘‘PT’’, are an abbreviation
of ‘‘pressure-time’’.
The PT Fuel System consists of the fuel pump, supply lines, drain lines, fuel passages and injectors.
The STC system is used on Cummins Diesel Engines to advance the injection timing under idle or light load
conditions.
The STC system includes fuel pump, supply lines, drain lines, fuel passages, oil passages, check valves, STC
oil control valve and STC injectors.
Section 5 - Fuel System Fuel System General Information
N14 Page 5-3
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