CUMMINS N14 - Fuel Consumption - Excessive

Fuel Consumption - Excessive
Cause Corrections
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Verify Complaint
OK
f
Fill out Fuel Consumption Check List. If
excessive fuel consumption is relevant,
continue with this chart. If low power is
relevant, go to ‘‘Engine Output Power Low’’
Chart. If acceleration is poor, go to ‘‘Engine
Acceleration/Response Poor’’ Chart.
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Oil Level Incorrect
OK
f
Check oil level. Refer to Procedure 2-10.
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Intake Air Restriction Excessive
OK
f
Visually inspect air filter and restriction
indicator and replace air filter if necessary.
Refer to Procedure 3-04.
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Fuel Leaks
OK
f
Visually check fuel system and supply
for leaks.
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Driver Technique Incorrect
OK
f
Address driver related factors. Refer to the
N14 Operation and Maintenance Manual,
Bulletin No. 3666024.
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Vehicle and Environmental Factors
(Ambient Temperatures, Wind, Tires,
Aerodynamic Aids, Axle Alignment,
Routes, etc.)
OK
f
Consider vehicle and environmental
factors when evaluating fuel
consumption.
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Verify Fuel Pump Code and Turbo-
charger Part Number
OK
f
Visually inspect fuel pump dataplate for
correct code. Visually inspect turbocharger
for correct part number.
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Engine Drivetrain Specified Incorrectly
OK
f
Perform VE, VMS, or truck spec vehicle
gearing check.
(Continued)
SectionT-Troubleshooting Troubleshooting Symptoms Charts
N14 Page T-75