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On Board Refueling Vapor Recovery (ORVR)
NGEC1002
SYSTEM DESCRIPTION
NGEC1002S01
SEF206VA
From the beginning of refueling, the fuel tank pressure goes up. When the pressure reaches the setting value
of the refueling control valve (RCV) opening pressure, the RCV is opened.After RCV opens, the air and vapor
inside the fuel tank go through refueling EVAP vapor cut valve, RCV and refueling vapor line to the EVAP
canister. The vapor is absorbed by the EVAP canister and the air is released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed
and refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is
purged during driving.
The RCV is always closed during driving and the evaporative emission control system is operated the same
as conventional system.
WARNING:
When conducting inspections below, be sure to observe the following:
쐌 Put a “CAUTION: INFLAMMABLE” sign in workshop.
쐌 Do not smoke while servicing fuel system. Keep open flames and sparks away from work area.
쐌 Be sure to furnish the workshop with a CO
2
fire extinguisher.
CAUTION:
쐌 Before removing fuel line parts, carry out the following procedures:
a) Put drained fuel in an explosion-proof container and put lid on securely.
b) Release fuel pressure from fuel line. Refer to “Fuel Pressure Release”, EC-51.
c) Disconnect battery ground cable.
쐌 Always replace O-ring when the fuel gauge retainer is removed.
쐌 Do not kink or twist hose and tube when they are installed.
쐌 Do not tighten hose and clamps excessively to avoid damaging hoses.
쐌 After installation, run engine and check for fuel leaks at connection.
쐌 Do not attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.
Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION
KA24DE
On Board Refueling Vapor Recovery (ORVR)
EC-39
GI
MA
EM
LC
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
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