Page 297 of 2492
FUEL TANK
Filler neck
19
UNLEADED PETROL
1 - Filler neck outlet - fuel passage
2 - Degassing when filling
3 - Breather
4 - Connection to canister (petrol vapour)
DIESEL
DI1903 DI1904
DI1905
A - Overfilling valve
B - Excess - insufficient pressure safety valve
C - Restriction valve
D - Valve preventing leaks if the vehicle is turned
over
PRG19.3
19-23
Page 298 of 2492

FUEL TANK
Filler neck
19
ROLE OF THE VALVES
A) Over-filling valve
When the fuel filler cap is removed, the valve
is closed, locking a volume of air in the brea-
ther chamber. This prevents fuel from ente-
ring this chamber.
When the filler cap is replaced, the valve
opens and the fuel tank breather is again
connected to the canister.
B) Excess - insufficient pressure safety valve
If the fuel vapour recirculation circuit is
blocked, this valve prevents the fuel tank from
excess pressure (the fuel tank would other-
wise inflate) or insufficient pressure (as fuel is
used, the fuel tank would be crushed).
C) Restriction valve
This valve prevents leaded fuel from entering
the fuel tank.
D) Valve preventing leaks if the vehicle is turned
over
If the vehicle is turned over, this valve pre-
vents the fuel tank from emptying, either
through the pipe to the canister or the brea-
ther pipe (Diesel).
The fuel tank has a sealed filler cap and a ventila-
tion circuit.
The filler neck for unleaded fuel has:
- an opening which is narrower and incompati-
ble with a leaded fuel pump nozzle (lead would
pollute the depollution system: the oxygen
sensor and catalytic converter),
- a valve blocking the filling opening (C) (to pre-
vent fuel vapour evaporating or fuel coming
out of the tank).
Refitting the fuel filler cap releases the over-filling
valve (A), allowing the tank to breathe through
the breather.
99212R
19-24
Page 299 of 2492
FUEL TANK
Gauge
19
For petrol engines, the pump and gauge sender
unit are an inseparable assembly.
For diesel engines, there is no pump submerged in
the fuel tank, there is only a gauge sender unit.
For removing the gauge sender unit refer to the
section FUEL TANK "Pump - sender unit".
Checking the gauge sender unit
Ensure the resistance varies by moving the float.
DisplayValue between terminals
A1 and B1 (in Ω)
4/4 7 maximum
3/4 54.5 ± 7
1/2 98 ± 10
1/4 155 ± 16
Minimum 300 ± 20
Display Height H (in mm)
4/4 48
3/4 90
1/2 133
1/4 147
Minimum 190
Measuring the height H
With the gauge sender unit removed, place it on a
flat surface.
H is the height measured between the float pin
and the working surface.
NOTE : these value are given for information only.
19-25
Page 300 of 2492
Mot. 1264-01 Wrench for removing the pump -
sender unit nut.
Mot. 1265 Pliers for removing quick release
unions (petrol engine)
Mot. 1265-01 Pliers for removing quick release
unions (diesel engine)
FUEL TANK
Pump and sender unit
19
SPECIAL TOOLING REQUIRED
IMPORTANT :
During all operations on the fuel tank or fuel sup-
ply circuit, it is vital to:
- avoid smoking and keep all heat sources away
from the working area,
- take precautions against fuel splashes due to
the residual pressure in the fuel pipes when
they are removed.
REMOVAL
The fuel tank does not need to be removed to re-
move the pump and sender unit assembly. It may
be reached from inside the vehicle as follows :
- disconnect the battery,
- lift the rear bench seat,
- remove the plastic cover,
- disconnect the electrical connector (1),
- remove the clips (2).
97163R5
19-26
Page 301 of 2492
FUEL TANK
Pump and sender unit
19
Use pliers Mot. 1265 (petrol engine) or Mot. 1265-
01 (diesel engine) to disconnect:
- the fuel supply pipe (3) (marked by a green
quick release union),
- the fuel return pipe (4) (marked by a red quick
release union and an arrow (B)).
96420R1
Remove the mounting nut (5) using tool
Mot. 1264-01 (release the nut, remove the tool
then slacken the nut by hand and remove it).
Remove the pump and sender unit assembly.
99367S
NOTE : if several hours may elapse between remo-
ving and refitting the pump and sender unit as-
sembly, refit the nut to the fuel tank to prevent it
from distorting.
19-27
Page 302 of 2492
FUEL TANK
Pump and sender unit
19
REFITTING
Check the seal is not damaged and renew it if ne-
cessary.
First fit the seal on the fuel tank before refitting
the assembly.
Position the pump and sender unit assembly (ar-
row (F) should be aligned with the longitudinal
axis of the vehicle, pointing backwards).
Fit the nut and tighten it to a torque of
3.5 daN.m.
Clip the fuel pipes back together (tools Mot. 1265
or Mot. 1265-01 do not need to be used).
Refit the safety clips (2).
Reconnect the electrical connector .
Refit the plastic cover.
ALLOCATION OF CONNECTOR TRACKS
TRACK ALLOCATION
A1 Earth
A2 Low fuel warning light
B1 Gauge information to instrument panel
B2 Not used
C1 Pump
C2 Pump
19-28
Page 303 of 2492
ENGINE SUSPENSION
Suspended engine mountings
19
ADJUSTING THE LONGITUDINAL MOVEMENT LIMITER FOR F ENGINES
Slacken limiter bolts (E).
Insert the limiter centring fork Mot. 1289-03 into the openings on the suspended engine mounting cover.
Tighten the two bolts (E) to a torque of 5 to 6.5 daN.m.
99174-2R
F engine (petrol)
99166-1R1
F engine (diesel)
F ENGINES
19-29
Page 304 of 2492
ENGINE SUSPENSION
Suspended engine mountings
19
TIGHTENING TORQUES (in daN.m)F3R ENGINE
99308R
*Tighten the stud to 6 daN.m
**Tighten the nut to 4 daN.m
19-30