Fuel Lines And Flexible Hoses; Preheater Fuel Filter - PREVOST H3-41 Maintenance Manual

SECTION 03 : FUEL SYSTEM

Remove the fuel pump.
NOTE
Only unfasten the bolts marked with arrows.
FIGURE 9: 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.

Install the fuel pump. Torque-tighten bolts to
specification.
FIGURE 10: FUEL PUMP DRIVE AXLE
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.
10 PA1621 Maintenance Manual All Series | Section Revised September 2017

Start the engine and let run for 5 minutes.
Make sure that there are no leaks.

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,
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.
schematic diagram of the fuel system (Figure 1).
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. PREHEATER FUEL FILTER

On H3 series vehicles, the preheater fuel filter is
located beside the preheater in the dedicated
compartment above the rear wheelhousing, on
the L.H. side of vehicle.
On X3 series vehicles, the preheater fuel filter is
located beside the preheater in the engine
coolant heater compartment, and is accessible
by opening the evaporator compartment door.
and heated surfaces,
Refer to the