Engine Power Output Low - Basics (Continued)
Cause Corrections
----------
CAC Plumbing/Cooler Air Leak
OK
f
Perform leak down test. Refer to
Procedure 3-11.
----------
Fuel Grade Incorrect or Fuel Quality Poor
OK
f
Check fuel and compare to specifications.
Operate engine from a temporary supply tank
with high quality fuel. Check engine opera-
tion. Replace fuel and filters as necessary.
----------
Fuel Inlet Temperature to Pump Too
High (Above 70°C [158°F]
OK
f
Fill fuel tanks or turn off fuel heater. Refer
to Fuel for Cummins Engines, Bulletin No.
3379001, for specifications.
----------
Tachometer or Speedometer Not Correct
OK
f
Check operation with calibrated tachometer.
----------
Air in Fuel
• Spongy Throttle - PT
• Misfire - Midrange
OK
f
Check for air. On PT engines, refer to
Procedure 5-16. Tighten all fittings between
fuel pump and fuel tank. For CELECT™
engines, refer to the N14 CELECT™ System
Troubleshooting and Repair Manual, Bulletin
No. 3810469.
----------
AFC Plunger Not Fully Open
OK
f
Check AFC air tube and fuel drain lines for
restriction and/or leaks. Check for proper
venting on AFC assemblies. To check AFC
operation, refer to Procedure 5-02. To replace
fuel pump, refer to Procedure 5-20.
----------
Check the Application Specific Problems
Refer to the ‘‘Industrial,’’ ‘‘Genset,’’
‘‘Marine,’’ or ‘‘Automotive’’ Application
Specific Problem Section.
Troubleshooting Symptoms Charts SectionT-Troubleshooting
N14Page T-46
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