TM 5-3895-383-24
4.
Low quality fuel:
Remove a small amount of fuel from the tank and
check for water in the fuel. If there is water in the
fuel, remove fuel from the tank until the tank is free
of water. Change the fuel filter and fill the fuel tank
with a good quality fuel. The fuel priming pump (if
equipped) may be used to fill the fuel filter and fuel
gallery (in the cylinder head), from the fuel tank
before the engine is started. If there is no water in
the fuel, start the engine by using an outside source
of fuel. If engine starts correctly using different fuel,
remove all fuel from the tank and fill with a good
quality fuel.
5.
Low fuel pressure:
At starting rpm, the minimum fuel pressure for the
fuel transfer pump must be 20 kPa (3 psi) with
clean fuel filters. If the fuel pressure is less than 20
kPa (3 psi), look for air in the fuel system. (If fuel in
the fuel tank cannot be checked for air, install a
sight tube in the fuel return line). If the fuel
pressure is still low, check the pressure regulating
orifice and the fuel transfer pump for correct
operation.
6.
Fuel injection timing not correct:
Check and make necessary adjustments as per
Testing and Adjusting Section of the Service
Manual.
7.
Valve adjustment not correct:
Check and make necessary adjustments as per
Testing and Adjusting Section of the Service
Manual. Intake valve lash is 0.38 mm (.015 in) and
exhaust valve lash is 0.64 mm (.025 in).
8.
Defective fuel injector(s):
Remove the fuel injectors and test as per Testing
and Adjusting Section of the Service Manual.
9.
Low compression:
Refer to Problem No. 4, Engine Misfiring Or
Running Rough.
10.
Water in fuel system:
Check for cracked sleeve or sleeve to head joint.
Repair as needed or install new components.
11.
Starting aids failed or not used:
Repair as needed or install new components.
Exhaust Smoke Cannot Be Seen While Starting
Probable Cause(s)
12.
No fuel in tank(s):
Check fuel level visually (do not use the fuel gauge
only). If equipped with two tanks, be sure tank
selection valve is open to the tank with fuel in it. Be
sure valve in fuel line between the tanks is open.
13.
Binding rack:
Repair as needed or install new components.
14.
No fuel from fuel transfer pump:
Loosen the fuel line from the fuel filter to the rear of
the cylinder head. With ignition switch in the RUN
position and accelerator in the "FUEL ON" position,
turn the engine with the starter to be sure there is
no fuel from the fuel transfer pump. To find the
cause for no fuel, follow Steps (a) through (d) until
the problem is corrected.
a.
The fuel priming pump (if equipped) may be used to
fill the fuel filter and fuel gallery (in the cylinder
head), from the fuel tank before the engine is
started.
b.
Check shutoff solenoid by turning ignition switch to
the RUN position. You must hear a sound when
the plunger opens. If no sound is heard, make sure
there is battery voltage at the solenoid. If the
solenoid does not work, install a new solenoid.
c.
If you are not using a good quality of fuel at
temperatures below -12C (10F), it is possible that
the fuel in the system can "wax" (not have correct
flow characteristics) and cause a restriction in the
fuel system. Install a new fuel filter. It may be
necessary to drain the complete fuel system and
replace with No. 1 grade fuel.
d.
Check for fuel supply line restriction by removing
the fuel supply line for the fuel filter base. Put 35
kPa (5 psi) of air pressure to the fuel tank.
NOTICE
Do not use more than 55 kPa (8 psi) of air pressure in the
fuel tank or damage to the tank may result.
If there is no fuel, or only a weak flow of fuel from the
fuel supply line, there is a restriction in the fuel supply
line and/or the fuel tank.
6-33
