Blue Bird Coachworks 450 LXi, Owner'S Manual

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450 LXi Owner Manual 5-3 Engine Maintenance
Rev. “C”
~ 5-3-33 ~
5-3.37 Fuel System - Prime
5-3.37.1 C11 and C13 On-highway Engines
The Secondary Fuel Filter Has Been Replaced
Turn the ignition switch to the “OFF” position. 1.
(1) Fuel Priming Pump,
(2) Air Purge Screw, (3) Priming Valve (if equipped)
Start the engine. Operate the engine at 1000 to 1200 rpm until the
engine runs smoothly in order to remove the residual air from the fuel
system.
Once the engine runs smoothly, stop the engine. Turn the ignition
switch to the OFF position.
Turn the priming valve (3) (if equipped) to the “Closed (Prime)”
position in order to prime the fuel system.
2.
3.
a.
While you operate the hand priming pump (1), observe air purge screw (2). When a small drop of fuel appears at the
threads of the air purge screw, close and tighten air purge screw (2).
Clean any residual fuel from the engine components.
Continue to operate the fuel priming pump (1) until a strong resistance is felt. Listen for an audible click from the fuel
manifold. The click will indicate that the valve has opened and the fuel system is pressurized. Lock the fuel priming
pump (1).
c.
d.
e.
WARNING!!
Fuel leaked or spilled onto hot surfaces or electrical components can cause a fi re. To help
prevent possible injury, turn the start switch off when changing fuel fi lters or water separator elements. Clean
up fuel spills immediately.
NOTICE: Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately.
NOTICE: Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component
that will be disconnected. Fit a suitable cover over disconnected fuel system component.
NOTE: Refer to “ Fuel System Secondary Filter - Replace ” section for more information on replacing the fi lter.
NOTICE: Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for
two minutes before cranking the engine again.
NOTE: You may use the hand priming pump for the fuel
fi lter (if equipped) instead of starting the engine and running the
engine. Perform the following procedure when the hand priming
pump is used:
Open the air purge screw (2) for the fuel fi lter by three full turns. Do not remove the air purge screw. b.
NOTE: Failure to tighten all fi ttings could result in serious fuel leaks.