PREVOST X3-45 COMMUTER User Manual

SECTION 03 : FUEL SYSTEM
10
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
3. 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.
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.
CAUTION
Oil level above the dipstick full mark or a
decrease in lube oil consumption may indicate
internal fuel leaks. Check oil level frequently.
4. FUEL TANK (STEEL)
This vehicle is equipped with a steel fuel tank
with a legal capacity (corresponding to 95% of
gross capacity) of 180 US gallons (681 liters).
The fuel filling access door is located on the R.H.
side of vehicle providing easy fuel filling.
The tank is also equipped with a Emco-Wheaton
posi-lock fuel filler neck and a Level Control
Valve (LCV) on the fuel tank connection panel to
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 volume,
permitting a small build-up of pressure in the
tank. When the back pressure reaches between
1.1 and 1.5 psig it forces the filling nozzle to
close automatically.
FIGURE 11: STEEL FUEL TANK ASSEMBLY
5% of tank inside space is kept filled with air,
allowing for a fuel expansion safety margin. A
drain plug, accessible from under the vehicle, is
fitted at the bottom of the tank.
4.1 DRAIN PLUG
NOTE
For faster emptying, it is recommended to
siphon fuel through the opening left on the
connection panel once the pressure relief valve
is removed.
Apply Loctite 567 Thread Sealant on drain
plug. With any sealant, the first one or two
threads should be left uncovered to avoid
system contamination.

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in