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TM 9-2320-312-24-2
Testing and Adjusting Section
4. If fuel quality is still suspected as a possible
i01370330
cause to problems regarding engine
Fuel Quality - Test
performance, disconnect the fuel inlet line, and
temporarily operate the engine from a separate
SMCS Code: 1280-081
source of fuel that is known to be good. This
will determine if the problem is caused by fuel
This test checks for problems regarding fuel quality.
quality. If fuel quality is determined to be the
Refer to Diesel Fuels and Your Engine, SEBD0717
problem, drain the fuel system and replace the
for additional details.
fuel filters. Engine performance can be affected
by the following characteristics :
Use the following procedure to test for problems
regarding fuel quality:
Cetane number of the fuel
1. Determine if water and/or contaminants are
Air in the fuel
present in the fuel. Check the water separator (if
equipped). If a water separator is not present,
Other fuel characteristics
proceed to Step 2. Drain the water separator, if
necessary. A full fuel tank minimizes the potential
for overnight condensation.
i01823195
Fuel System - Prime
Note: A water separator can appear to be full of fuel
when the water separator is actually full of water.
SMCS Code: 1258-548
2. Determine if contaminants are present in the
fuel. Remove a sample of fuel from the bottom
of the fuel tank. Visually inspect the fuel sample
for contaminants. The color of the fuel is not
Fuel leaked or spilled onto hot surfaces or elec-
necessarily an indication of fuel quality. However,
trical components can cause a fire. To help pre-
fuel that is black, brown, and/or similar to sludge
vent possible injury, turn the start switch off when
can be an indication of the growth of bacteria or
changing fuel filters or water separator elements.
oil contamination. In cold temperatures, cloudy
Clean up fuel spills immediately.
fuel indicates that the fuel may not be suitable
for operating conditions. The following methods
If the engine's fuel system is run dry, fill the fuel
can be used to prevent wax from clogging the
tank. Then prime the fuel system in order to remove
fuel filter:
any air bubbles from the system.
Fuel heaters
NOTICE
Blending fuel with additives
Do not loosen fuel lines at the fuel manifold. The
engine components may be damaged and/or loss of
Utilizing fuel with a low cloud point such as
priming pressure may occur when the fuel lines are
kerosene
loosened.
Refer to Operation and Maintenance Manual,
"Fuel Recommendations" for more information.
3. Check fuel API with a 9U-7840 Fluid and Fuel
Calibration Gp for low power complaints. The
acceptable range of the fuel API is 30 to 45
when the API is measured at 15 C (60 F), but
there is a significant difference in energy within
this range. Refer to Tool Operating Manual,
NEHS0607 for API correction factors when a low
power problem is present and API is high.
Note: A correction factor that is greater than 1.000
may be the cause of low power and/or poor fuel
consumption.

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