SECTION 03: FUEL SYSTEM
8
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Section 03 revised May 2018)
volume, permitting a small build-up of pressure
in the tank. When the back pressure reaches
between 1.1and 1.5 psig it forces the filling
nozzle to close automatically.
FIGURE 8: STEEL FUEL TANK ASSEMBLY
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.
3.1 FUEL TANK 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.
FIGURE 9: FUEL TANK DRAIN PLUG
The proper method of assembling this tapered
threaded drain plug is to screw it to the finger
tight position and then wrench tighten further 2-3
turns. If leakage persists, check for damaged
threads.
3.2 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 chassis at the recommended jacking
points.
NOTE
Before removal, the fuel tank should be
completely emptied by unscrewing the drain
plug. For faster emptying, it is recommended to
siphon fuel through the opening left on the
connection panel once the pressure relief valve
is removed.
Ensure that the container used has a capacity
equal to the amount of fuel remaining in the
tank.
1. Open the condenser door.
2. Unscrew clamps retaining R.H. side filler
tube to fuel tank and filler neck. Disconnect
tube and remove it.
3. Unscrew engine fuel supply and return lines
from fuel tank connection panel.
4. Disconnect the fuel level sender electrical
wires (3wires). Prior disconnecting, identify
the wires and proper terminal on the fuel
level sender as reference for reinstallation
(Figure 10).
5. Using mobile column lifts, raise the vehicle
to gain access to the fuel tank support from
underneath.
6. Before removing the bolts securing the tank
support to the chassis, lower the vehicle and
make sure the tank support is adequately
supported with jack stands or wood blocks.
Failure to do so could result in injury as well
as damage to the tank.
