Section 03: FUEL SYSTEM
PA1562
13
4. 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 (Fig. 1 &
7).
CAUTION
Oil level above the dipstick full mark or a
decrease in lube oil consumption may indicate
internal fuel leaks. Check oil level frequently.
5. PREHEATER FUEL FILTER
The preheater fuel filter is located beside the
preheater and is accessible through engine
compartment R.H. side door.
MAINTENANCE
Replace preheater fuel filter every 50,000 miles
(80 000 km) or once a year, whichever comes
first.
6. FUEL TANK
X3-45 coaches are equipped with a high-density
cross-link polyethylene fuel tank with a capacity
of 208 US gallons (787 liters).
On all vehicles, fuel filling access doors on both
sides of vehicle provide direct access to filler
necks; offering the added advantage of refueling
from either side of vehicle.
A pressure relief valve on the fuel tank
connection-panel relieves high-pressure buildup
and an overflow tube allows offset air in the tank
to escape during filling. For 95% of the tank
volume, 5% of tank inside space is kept filled
with air with no exit opening, allowing for a fuel
expansion safety margin. A drain plug,
accessible from under the vehicle, is fitted at the
bottom of the tank.
6.1 TANK REMOVAL
DANGER
Park vehicle safely, apply parking brake, stop
engine and set battery master switch(es) to the
OFF position prior to working on the vehicle.
Before working under an air-suspended
vehicle, it is strongly recommended to support
the body at the recommended jacking points.
NOTE
Before removal, the fuel tank should be
completely drained by unscrewing the drain
plug. Ensure that the container used has a
capacity equal to the amount of fuel remaining
in the tank.
1. Open the condenser door and remove the
fuel tank access panel. The rear baggage
compartment fuel tank access panel may
also be removed to facilitate access to
components.
2. If applicable, unscrew clamps retaining L.H.
side filler tube to the fuel tank, then
disconnect tube and remove it.
3. Unscrew clamps retaining R.H. side filler
tube to fuel tank and filler neck. Disconnect
tube and remove it.
4. If applicable, unscrew preheater supply line,
preheater return line, auxiliary return line
and/or auxiliary return line from fuel tank
connection-panel.
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