PREVOST LE MIRAGE XLII BUS SHELLS Maintenance Manual Download

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Section 03: FUEL SYSTEM

PA1564

SCREW

NYLON WASHER

ANCHOR NUT

FUEL TANK INTERIOR

FIGURE 10: FUEL TANK REPAIR

03014

PRIMING FUEL SYSTEM

The problem with restarting a diesel engine that
has run out of fuel, is that after the fuel is
exhausted from the tank, it is pumped from the
primary fuel filter or the fuel filter/water separator
(if vehicle is so equipped), and sometimes
partially removed from the secondary filter. This
results in an insufficient fuel supply to sustain
engine firing. The primary fuel filter or fuel
filter/water separator and secondary filter must
be free of air in order for the systems to provide
adequate fuel for the injectors. When the engine
runs out of fuel, the following operations must be
performed before restarting:

Fill fuel tank with the recommended fuel oil. If
only partial filling is possible, add a minimum of
10 gallons (38 liters) of fuel.

If the vehicle is equipped with a Fuel Pro

382 fuel filter/water separation, pour fuel
through spin on cap as per "4.3 DAVCO
FUEL PRO 382".

First method:

1. Close the primary fuel filter shut-off valve.

Close the shut-off valve on the secondary
filter head and remove the spin-on fuel filters.
Fill with clean fuel through the fuel inlet holes
(the outer ring of small holes on the element)
to insure the fuel is filtered;

2. Thread the elements onto the adaptor inserts

until the gaskets make full contact with the
adaptor head and no side movement is
evident. Tighten filters an additional one-half
turn by hand, or as indicated on the filter.

3. Open the fuel shut-off valves, start the

engine and check for leaks.

Second method:

1. Unscrew the cap on the priming valve

located on the secondary filter;

2. Direct fuel under pressure 25 psi (172 kPa)

to the priming valve using a quick coupling;

3. Start the engine and check for leaks.

FUEL PUMP INSTALLATION

The fuel pump is driven off the rear of the air
compressor.

FIGURE 11: FUEL PUMP LOCATION

03070

1. If removed, install inlet and outlet fittings in

the cover of the fuel pump.

NOTE

New fittings have sealant already applied.
When reusing fittings, coat the threads lightly
with Locktite Pipe Sealant, Detroit Diesel
number J 26558-92, or equivalent, before
installing. To prevent sealant from entering
fuel system, do not apply to the first two
threads of the fitting. Do not use Teflon tape or
paste on the fittings.

2. Install drive coupling in drive hub of the fuel

pump. Install a new gasket to the mounting
flange of the pump.

3. Index the drive coupling with the drive hub on

the end of the air compressor crankshaft and
align the pump mounting bolt holes with
those in the air-compressor rear cover.

NOTE

When correctly positioned, the outlet fitting on
the pump should be in approximately an 8
o'clock position when viewed from the rear,
and the drain opening in the pump body facing
down.

PREVOST LE MIRAGE XLII BUS SHELLS, Maintenance Manual

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