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On Board Refueling Vapor Recovery (ORVR)
NFEC0744
SYSTEM DESCRIPTION
NFEC0744S01
SEF206VA
SEF830X
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:
I Put a “CAUTION: INFLAMMABLE” sign in workshop.
I Do not smoke while servicing fuel system. Keep open flames and sparks away from work area.
I Be sure to furnish the workshop with a CO
2
fire extinguisher.
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
On Board Refueling Vapor Recovery (ORVR)
EC-42
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