1995 RENAULT MEGANE SCENIC Fuel

FUEL MIXTURE
Manifolds
12
Remove the exhaust manifold. From above the vehicle:
Remove the 2 bolts (B).
DI1207
F3R engine
REFITTING
The manifold gasket should be fitted with the
metal side against the manifold (crimped side
against the cylinder head).
Refitting is the reverse of removal.
12-21

FUEL SUPPLY
Fuel cut-out on impact
13
AIM
The aim of this function is to avoid a fire after an
accident due to a fuel leak. To accomplish this, all
components which pump fuel from the fuel tank
are stopped during and after the impact. They
may only be started again by a mechanical action
performed by the driver or repair mechanic.
DESCRIPTION
The system comprises an inertia switch which may
be reset, which:
- detects the impact (1),
- cuts the electrical circuit.
99511R
It is mounted:
• For petrol engines, between track 1 of the
pump relay (236) and the + feed.• For diesel engines, between the + feed and
the fuel shut off (or the coded solenoid valve
if the vehicle is fitted with an engine
immobiliser).
OPERATION
During the impact, the inertia switch ball leaves its
seat and breaks the electrical current.
For petrol engines, the + feed to the pump relay
control circuit (236) is cut. The pump and the
injectors are thus no longer fed electrically.
The fuel in the fuel tank is therefore isolated.
For diesel engines, the + feed to the fuel shut off
or the coded solenoid valve is cut.
The pump can no longer take up fuel, there is no
high pressure any more. Any risk of fire due to
high pressure diesel spray over the engine is
removed.
RESETTING THE SWITCH AND SWITCH
OPERATION
To reset the inertia switch, press the top to
reposition the ball in its seat.
IMPORTANT:
• for petrol engines, after resetting the switch,
the computer memory
MUST be erased using
the XR25. The injection computer will
memorise a pump relay fault when the system
is triggered.
• for diesel engines, after resetting the switch,
the passenger compartment connection unit
memory
MUST be erased using the XR25. This
unit will memorise a break in feed to the
coded solenoid valve.
13-1

FUEL SUPPLY
Fuel cut-out on impact
13
WIRING DIAGRAM
Key
120Injection computer
199Fuel pump
236Fuel pump relay
246Fuel shut off
927Inertia switch
PRJ99472
13-2

FUEL SUPPLY
Fuel gallery
13
K7M engine
Fuel gallery mounting bolt on manifold 0.8
TIGHTENING TORQUES (in daN.m)
REMOVAL
Disconnect the battery.
Remove the acoustic tie bar.
Disconnect:
- the oil vapour rebreathing pipes (1) and the
fuel vapour recirculation pipes (2),
- the connectors for the injectors (3) and the
canister bleed solenoid valve (4),
- on the manifold, the pipe (5) connecting the
pressure regulator to the manifold vacuum,
99372R
- the fuel supply pipes (6) and return pipes (7)
using the small section tool Mot. 1311-06 (the
fuel supply pipe uses a removal tool
connected to the union fitted on the vehicle).
99375R
SPECIAL TOOLING REQUIRED
Mot. 1311-06 Tool for removing fuel pipe
unions
99370R
13-3

FUEL SUPPLY
Fuel gallery
13
K7M engine
To remove the unions, fit toolMot. 1311-06
between the two parts (A) and (B).
Press on the tool to lift the two retaining claws
then pull the union.
99461R1
Remove the three gallery mounting bolts then
remove the gallery.
99369R
To remove an injector, remove clips (8) then pull
the injectors.
99373R
REFITTING
Renew the O rings at the base of the injectors (if
the injector has been removed, also renew the
seal at the head of the injector).
The fuel supply and return unions should click
when they are correctly connected.
Refitting is then the reverse of removal.
13-4

99238R1
FUEL SUPPLY
Fuel gallery
13
Throttle body mounting bolt on manifold 2
Fuel gallery mounting nut 1
TIGHTENING TORQUES (in daN.m)
REMOVAL
Disconnect the battery.
Remove the acoustic tie bar.
Disconnect:
- the air temperature sensor (1),
- the pressure sensor (3),
- the throttle potentiometer (4),
- the cylinder reference sensor (6),
- the fuel vapour recirculation pipe (11),
- the brake servo vacuum pipe (10),
- from the manifold, the pressure sensor
vacuum pipe (7).
Slacken the clip mounting the air sleeve to the
throttle body.
Remove the three nuts mounting the air filter.
99213R1
Remove the filter and the air sleeve.
Disconnect:
- the oil vapour rebreathing pipe (9),
- the coolant temperature sensor (2),
- the idle speed regulation solenoid valve (5). F3R engine
13-5

FUEL SUPPLY
Fuel gallery
13
Remove the four bolts mounting the throttle
body (do not disconnect the coolant hoses which
warm the throttle body).
Remove the heat shield between the throttle
body and the manifold.F3R engine
99239-1R
Unclip the wiring and the pipe mounted on the
manifold and tilt the assembly towards the
injection computer.
Disconnect the injectors.
Remove the wiring mounting.
Disconnect:
- the fuel supply pipe (17) on the flywheel end,
marked by a green ring,
- the return pipe to the fuel tank (18) at the
timing end, marked by a red ring,
- the vacuum pipe (19) for the fuel pressure
regulator.
99229R
Remove the fuel gallery by sliding it along the
inlet manifold.
99229-1S
Remove:
- the two fuel gallery mounting nuts,
- the earth strap (15).
13-6

FUEL SUPPLY
Fuel gallery
13
REFITTING
Ensure the two plastic spacers are present. They
should be located on the two gallery mounting
studs between the studs and the cylinder head.
Remove the seals bonded on the throttle body
heat shield, then renew them (they do not need
to be bonded when refitting). F3R engine
99215S
Refitting is then the reverse of removal.
13-7