User Manual

36 SENR9977
Testing and Adjusting Section
i02253606
Fuel System - Prime
If air enters the fuel system, the air must be purged
before the engi
ne can be started. Air can enter the
fuel system when the following events occur:
•
The fuel tank i
s empty or the tank has been partially
drained during normal operation.
•
The low pressu
re fuel lines are disconnected.
•
A leak exists in the low pressure fuel system during
engine operat
ion.
•
The fuel filter or the fuel pump is replaced.
•
The high pressure fuel lines are disconnected.
Use the follo
wing procedure in order to remove air
from the fuel system:
1. Remove the co
ver for the fuel injectors.
2. Turn the key to the RUN position for three minutes
in order to en
ergize the fuel priming pump. Do not
start the engine. Then turn the key to the OFF
position.
g011350 20
Illustrat
ion 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
linestoatorqueof30N·m(22lbft).
6. Start the engine and check for leaks.
7. Install t
he cover for the fuel injectors.
i02253617
Fuel System Pressu re - Test
g0113504 2
Illustration 45
(1) Fuel tran
sfer pump
(2) Fuel filt
er housing
(3) Outlet f o
r the supply for the fuel injection pum p
(4) Outlet fo
r the return to the fuel tank
The pressure test measures the output pressure of
the fuel tran
sfer 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. Makeanoteof
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 co
ntainer that is capable of holding 3.0 L
(0.66 Imp gal) of fuel.
3. Energize th
e fuel transfer pump until a constant
flow of fuel is running from the outlet for the supply
for the fuel injection pump.
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 (0.4
4 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. Reconnec
t the outlet lines in the correct positions.