Operation and maintenance manual

QSB4.5 and QSB6.7 Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms Page TS-19
Engine Acceleration or Response Poor
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
Air intake or exhaust leaks
.............
Check for loose or damaged piping connections
and missing pipe plugs. Check the turbocharger
and exhaust manifold mounting. Refer to Section
4.
OK
Go To Next Step
STEP 12
Air intake system restriction is above specification
.............
Check the air intake system for restriction. Clean
or replace the air filter and inlet piping as
necessary. Refer to Section 4.
OK
Go To Next Step
STEP 13
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 14
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 15
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 16
Contact a Cummins® Authorized Repair Facility