Bleed Air From The Fuel System - Hitachi ZW 310-6 Operator's Manual

Bleed Air from the Fuel System

Air in the fuel system may make the engine hard to
start or make it run rough or not run at all.
After draining water and sediment from the fuel
filter, replacing the fuel filter, cleaning the fuel pump
strainer or running the fuel tank dry, be sure to bleed
the air from the fuel system according to the following
procedure.
Air Bleeding Procedure
This machine is equipped with a fuel priming solenoid
pump.
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CAUTION: Fuel leaks may lead to fires.
1. Turn the key switch to ON position. The fuel lift
pump operates to help prime the fuel system.
IMPORTANT: DO NOT start the engine.
2. The engine control module (ECM) operates the fuel
lift pump through a priming cycle which lasts at
least 30 seconds. Cycle the lift pump several times
by keying OFF, waiting 10 seconds, and keying ON
again.
3. Keep the key switch at ON position for at least 30
seconds after filling the main fuel filter.
4. Once the engine is started, slowly increase the
engine speed while air is purged from the fuel line.
5. Check the fuel supply system for fuel leaks.
IMPORTANT: Even if air is not thoroughly bled, do
not hold the key switch in the ON position for
more than 5 minutes.
In case air is not thoroughly bled, first return the
key switch to the OFF position. Then, after waiting
for more than 30 seconds, turn the key switch ON
again. Failure to do so may cause damage to the
electrical pump and/or discharging the batteries.
MAINTENANCE
If Air Mixed After Common Rail
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WARNING: INJECTION HAZARD
Fuel under high pressure
High pressure common rail, high pressure lines
fuel lines and high pressure fuel injection lines
contain high pressure fuel.
High pressure fuel injection into skin can cause
injury or death.
Keep hands away from injection lines while
turning engine with starter or while running
engine.
In case air mixed in the fuel system due to lack of
fuel and the engine is difficult to start, release air by
following the procedure given below.
1. Bleed air until the engine supply pump entrance
enough according to the above-mentioned
procedures.
2. Operate starter motor for long cranking within 20
seconds. If engine fails to start, return key switch to
OFF. Wait more than about 60 seconds, and then try
again.
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