Operation and maintenance manual

QSB4.5 and QSB6.7 Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms Page TS-23
Engine Difficult to Start or Will Not Start (No Exhaust Smoke)
Cause Correction
STEP 10
Air in the fuel system
.............
Check for air in the fuel system. Tighten or replace
the fuel connections, fuel lines, fuel tank
standpipe, and fuel filters as necessary.
OK
Go To Next Step
STEP 11
Electronic control module (ECM) is locked up
.............
Disconnect the battery cables for 30 seconds.
Connect the battery cables, and start the engine.
OK
Go To Next Step
STEP 12
Fuel filter or fuel suction line is restricted
.............
Replace the fuel filter. Refer to Section 5. Check
the fuel suction line for restriction Section 5.
OK
Go To Next Step
STEP 13
Fuel supply is not adequate
.............
Check the flow through the filter to locate the
source of the restriction. Refer to Section 5.
OK
Go To Next Step
STEP 14
Fuel drain backup
.............
Verify the fuel return line is plumbed to the bottom
of the fuel tank.
OK
Go To Next Step
STEP 15
Contact a Cummins® Authorized Repair Facility