Operation and maintenance manual

QSB4.5 and QSB6.7 Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms Page TS-37
Engine Starts But Will Not Keep Running
Cause Correction
STEP 1
Fuel level is low in the tank
.............
Fill the supply tank. Refer to the OEM service
manual.
OK
Go To Next Step
STEP 2
Battery voltage supply to the electronic control
module (ECM) is low, interrupted, or open
.............
Check the battery connections. Refer to the OEM
service manual.
OK
Go To Next Step
STEP 3
Electronic fault codes are active
.............
For instructions on how to read active fault codes,
refer to Section 1. If fault codes are active, contact
a Cummins Authorized Repair Facility.
OK
Go To Next Step
STEP 4
Idle speed is set too low for accessories
.............
Check and adjust the low-idle screw. Refer to a
Cummins Authorized Repair Facility.
OK
Go To Next Step
STEP 5
Engine-driven units are engaged
.............
Disengage engine-driven units. Refer to the OEM
service manual.
OK
Go To Next Step
STEP 6
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 7
Fuel filter or fuel suction line is restricted
.............
Replace the fuel filter. Refer to Section 5. Check
the fuel suction line for restrictionSection 5.
OK
Go To Next Step
STEP 8
Fuel grade is not correct for the application or the
fuel quality is poor
.............
Operate the engine from a tank of high-quality fuel.
Refer to Fuel Recommendations and
Specifications in Section V.
OK
Go To Next Step
STEP 9
Contact a Cummins® Authorized Repair Facility