Operation and maintenance manual

Fuel System QSB4.5 and QSB6.7
Page V-2 Section V - Maintenance Specifications
Fuel System
Specifications
For performance and fuel rate values, refer to the Engine Data Sheet.
Maximum Fuel Inlet Restriction - With gear pump only (no engine mounted electric fuel lift pump) (at gear pump inlet)
................................................................................................................................................................50.7 kPa [7.3 psi]
Rail Pressure - 4.5 liters [275 C.I.D.] and 6.7 liters [409 C.I.D.] ...............................250 to 1600 bar [3626 to 23,206 psi]
Fuel Pressure Range at Fuel Filter Inlet and Outlet (engine cranking) - With gear pump only (no electric fuel lift pump)
..........................................................................................................................................303 to 1103 kPa [44 to 160 psi]
Fuel Pressure Range at Fuel Filter Inlet and Outlet (engine running) - With gear pump only (no electric fuel lift pump)..
503 to 1303 kPa [73 to 189 psi]
Maximum Pressure Drop across Fuel Filter - With gear pump only (no electric fuel lift pump)................200 kPa [29 psi]
Maximum Fuel Drain Line Restriction........................................................................................................20 kPa [2.9 psi]
Maximum Fuel Inlet Temperature..................................................................................................................70°C [158°F]