Connect the fuel supply line to the air inlet heater.
Loosely tighten the connection fitting. Operate the
priming lever of the fuel transfer pump until only fuel
which is free of air flows from the connection. Tighten
the connection fitting.
Start the engine and operate the engine at low speed.
Check that there is no fuel leakage from the valve of the
air inlet heater.
If leakage exists, the air inlet heater must be replaced.
If no fuel leakage occurs, remove the plug from the
intake manifold and disconnect the fuel supply line from
the air inlet heater. Install the air inlet heater in the air
inlet manifold. Connect the fuel supply line to the
heater. Operate the priming lever of the fuel transfer
pump until only fuel which is free of air flows from the
connection. Connect the electrical wire connector.
Leak Test For The Air Inlet Heater On The Engine
Use this test in order to test for leakage of fuel in the air inlet
heater if a pressurized air supply is available.
Damage can be caused to the air inlet heater if air
with more pressure than 140 kPa (20 psi) is used.
Remove the air inlet heater from the inlet manifold.
Connect an air supply to the fuel inlet passage. The
maximum pressure of the air supply should be 140 kPa
Put the air inlet heater in a container of clean diesel fuel
for ten seconds. No air bubbles should be visible from
the air inlet heater. If the air inlet heater is not defective,
remove the fuel from the air inlet heater. Reinstall the
air inlet heater in the air inlet manifold. If leakage of air
occurs, install a new air inlet heater.
Conduct this test in order to determine if sufficient electrical
current is provided to the air inlet heater for proper operation.
Disconnect the electrical wire from the air inlet heater.
Connect the clamp lead of a 5P-7277 Voltage Tester to
a good ground connection.
Connect the probe end of the tester to the disconnected
The light of the tester turns on in order to indicate that
electrical continuity to the air inlet heater exists.
Connect an 8T-0900 Ammeter between the electrical
supply and the air inlet heater. Turn the ignition switch
to the ON position. Activate the switch for the air inlet
heater. The normal current is 16 to 18 amperes at 12
A cold engine should start after the heater coil
has operated for 20 seconds. If the engine does
not start but the air inlet heater and the area of the
inlet manifold around the air inlet heater are
warm, either the staring procedure has not been
done correctly or the problem is not caused by
the air inlet heater.
Pressure Test For The Fuel Transfer
The fuel transfer pump is located on the right side of the
The pressure test measures the output pressure of the fuel
transfer pump. Low fuel pressure and starting difficulty may be
indications of problems with the fuel lift pump.
Put a pressure gauge in the outlet of the fuel transfer
Disconnect the fuel injection pump solenoid wire (if
equipped). Put the fuel shutoff lever in the fuel shutoff
Crank the engine for ten seconds. Record the
maximum pressure. The pressure indication on the
gauge should be in the following ranges:
Maximum pressure ...................42 to 70 kPa (6 to 10 psi)
Minimum pressure .................................... 30 kPa (4.4 psi)
Observe the amount of time for the maximum pressure
that was recorded during cranking to decrease by one-
half. If the time is less than thirty seconds, the fuel
transfer pump must be replaced or repaired.