Section 03: FUEL SYSTEM
PA1553
10
5.3 FUEL TANK VERIFICATION
Inspect fuel tank from under vehicle for leaks or
fuel traces. If a leak is detected, repair
immediately as per "Polyethylene Fuel Tank
Repair" in this section.
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.
5.4 POLYETHYLENE FUEL TANK REPAIR
NOTE
Fuel level must be lower than perforation to
carry out this procedure.
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.
1. Locate perforation on fuel tank.
2. If necessary, remove fuel tank as per
instructions in this section.
3. Drill perforation with a 23/64" bit. Make sure
drill hole is perfectly round.
4. Insert a screw (Prevost #500196) and a
washer (Prévost #5001244) into anchor nut
(Prévost #500331).
5. Place assembly in drill hole. Tighten screw
by 10 complete turns. Refer to Fig. 8.
SCREW
NYLON WASHER
ANCHOR NUT
FUEL TANK INTERIOR
FIGURE 8: FUEL TANK REPAIR 03014
6. Apply sealant on head plug (Prévost
#507300) and seal hole with the head plug.
6. 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".
* If the vehicle is equipped with an optional
priming pump (see Figure 9).
Press the priming switch, located in the engine
compartment on the rear start panel. Start the
engine and check for leaks.
FIGURE 9: PRIME PUMP SWITCH LOCATION 06622
If the vehicle is not equipped with a priming
pump:
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.
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