CUMMINS N14 - Fuel Consumption Excessive - Performance Test Evaluation

Fuel Consumption Excessive - Performance Test Evaluation
NOTE: After conducting the performance test, use this chart to analyze the performance data.
Cause Corrections
----------
Intake Air Restriction Excessive
OK
f
Clean/replace air filter element or
damaged air intake piping.
----------
Fuel Inlet (Suction Line) Restriction
Excessive
OK
f
Check fuel plumbing. Replace as
necessary.
----------
Fuel Supply (Pump Out Line) Restric-
tion Excessive
OK
f
Inspect fuel plumbing to injectors. If appli-
cable, check fuel pressure before and after
auxiliary fuel control devices installed
between the fuel pump and the injectors.
----------
Fuel Drain Line Restricted (All But
CELECT™)
OK
f
Inspect fuel return system for loops, swelled
lines, or clamped points. Replace/reroute fuel
lines. Verify fuel tank vents are not blocked,
plugged, or corroded.
----------
PT Fuel Pump AFC ‘‘No-Air’’ Screw
Adjustment/Dual Spring AFC Plunger
Position Incorrect
OK
f
Check/adjust the AFC ‘‘No-Air’’ setting.
Refer to Procedure 5-20.
----------
PT Fuel Pump VS Governor Adjust-
ment Incorrect
OK
f
Check/adjust VS governor. Refer to PT
PACER Compulink™ Cartridge Manual,
Bulletin No. 3810443.
----------
Fuel Rate Low, Fuel Pressure High or OK,
Intake Manifold Pressure OK or Low*
OK
f
Clean/flush injectors. Replace if necessary.
Refer to Procedure 5-10. Check for injector
carboning.
(Continued)
* This symptom causes low power which can lead to excessive fuel consumption.
SectionT-Troubleshooting Troubleshooting Symptoms Charts
N14 Page T-77