SECTION 03: FUEL SYSTEM
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Section 03 revised May 2018)
7
NOTE
Only unfasten the bolts marked with arrows.
FIGURE 6: FUEL PUMP REMOVAL
CAUTION
Ensure to clean around the head of the bolts.
Debris will prevent the tool from fitting properly
and cause damage to the fasteners.
•
Check that the adapter and fuel pump drive
axle are not damaged.
FIGURE 7: FUEL PUMP DRIVE AXLE
•
Install the fuel pump. Torque-tighten bolt to
specification.
NOTE
Use a new sealing ring. Check that the fuel
pump drive axle sits correctly in the power
steering pump.
•
Using the hand primer on the fuel filter
housing, prime the fuel system.
•
Start the engine and let run for 5 minutes.
Make sure that there are no leaks.
2.
FUEL LINES AND
FLEXIBLE HOSES
Make a visual check for fuel leaks at all engine-
mounted fuel lines and connections and at the
fuel tank suction and return lines. Since fuel
tanks are susceptible to road hazards, leaks in
this area may best be detected by checking for
accumulation of fuel under the tank. Engine
performance and auxiliary equipment is greatly
dependent on the ability of flexible hoses to
transfer lubricating oil, air, coolant and fuel oil.
Diligent maintenance of hoses is an important
step in ensuring efficient, economical and safe
operation of engine and related equipment.
MAINTENANCE
Check hoses daily as part of the pre-start-up
inspection. Examine hoses for leaks and check
all fittings, clamps and ties carefully. Make sure
that the hoses are not resting on or touching
shafts, couplings, and heated surfaces,
including exhaust manifolds, any sharp edges
or other obviously hazardous areas.
Since all machinery vibrates and moves to a
certain extent, clamps and ties can fatigue with
age. To ensure continued proper support,
inspect fasteners frequently and tighten or
replace them as necessary. Refer to the
schematic diagram of the fuel system (Figure 2).
CAUTION
Oil level above the dipstick full mark or a
decrease in lube oil consumption may indicate
internal fuel leaks. Check oil level frequently.
3.
FUEL TANK
The X3-45 Commuter coach is equipped with a
steel
fuel tank with a legal
capacity
(corresponding to 95% of gross capacity) of 180
US gallons (681 liters) and 6.3 US gallons of
unusable fuel.
The fuel filling access door is located on the
R.H. side of vehicle providing easy fuel filling.
A Level Control Valve (LCV) on the fuel tank
connection panel relieves pressure buildup and
allows offset air in the tank to escape during
filling. A whistle mounted at the LCV outlet can
be heard as air escapes. During fueling, the
LCV will close when the fuel reaches the level in
the
tank corresponding to 95% of the tank
