If air enters the fuel system, the air must be purged
from the fuel system before the engine can be
started. Air can enter the fuel system when the
following events occur:
• The fuel tank is empty or the fuel tank has been
partially drained.
• The low-pressure fuel lines are disconnected.
• A leak exists in the low-pressure fuel system.
• The fuel filter is replaced.
Mechanical Priming Pump
Primary Filter
Ensure that the air is removed from the primary filter
before you prime the secondary fuel filter. Refer to
illustration 66 .
Illustration 66 g01316878
This filter may not be installed on the engine.
(1) Vent screws
Priming the Primary Fuel Filter
Illustration 67 g06221845
1. If equipped, operate the hand priming pump (2)
until fuel free from air comes from the vent screw
(1). Then close vent screw (1) by hand.
Illustration 68 g06221885
2. If the hand priming pump is not installed, operate
the starting motor to crank the engine. Crank the
engine to operate the transfer pump (3). Do not
operate the transfer pump for more than 15
seconds. After 15 seconds, stop and wait 30
seconds before operating the starting motor.
SEBU9064-08
91
Maintenance Section
Fuel System - Prime
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