Fuel System - Prime; Fuel System Pressure - Test - Perkins 1104E Systems Operation Testing And Adjusting

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Testing and Adjusting Section

Fuel System - Prime

If air enters the fuel system, the air must be purged
before the engine can be started. Air can enter the
fuel system when the following events occur:
•
The fuel tank is empty or the tank has been partially
drained during normal operation.
•
The low pressure fuel lines are disconnected.
•
A leak exists in the low pressure fuel system during
engine operation.
•
The fuel filter or the fuel pump is replaced.
•
The high pressure fuel lines are disconnected.
Use the following procedure in order to remove air
from the fuel system:
1. Remove the cover for the fuel injectors.
2. Turn the key to the RUN position for three minutes
in order to energize the fuel priming pump. Do not
start the engine. Then turn the key to the OFF
position.
Illustration 44
(1) Connections for the high pressure fuel lines
3. Loosen the connections for the high pressure fuel
lines (1).
4. Operate the electric starter motor until fuel that is
free of air comes from the connections.
5. Tighten the connections for the high pressure fuel
lines to a torque of 30 N·m (22 lb ft).
6. Start the engine and check for leaks.
7. Install the cover for the fuel injectors.
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Fuel System Pressure - Test

Illustration 45
(1) Fuel transfer pump
(2) Fuel filter housing
(3) Outlet for the supply for the fuel injection pump
(4) Outlet for the return to the fuel tank
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
transfer pump.
Check the Function of the Fuel
Transfer Pump
1. Make a note of the location of the fuel lines from
the fuel transfer pump. Remove the two lines from
the outlets (3) and (4).
2. Connect two lengths of 5/16 inch rubber hose
to outlets (3) and (4). Place the hoses into a
suitable container that is capable of holding 3.0 L
(0.66 Imp gal) of fuel.
3. Energize the fuel transfer pump until a constant
flow of fuel is running from the outlet for the supply
for the fuel injection pump.
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Note: The flow from the outlet for the return for the
fuel tank will have a slower flow rate.
4. Measure the combined flow of both outlets with
a stopwatch. Fuel flow should be a minimum of
2.0 L (0.44 Imp gal) per minute.
5. If the combined flow is less than 2.0 L
(0.44 Imp gal) per minute, replace the fuel transfer
pump.
6. Reconnect the outlet lines in the correct positions.
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