The fuel vapor recovery system prevents fuel vapors from escaping into the atmosphere, which adversely affect the environment
The system uses the method of absorbing vapors with a carbon adsorber, which is installed in the arch of the right front wheel.
The solenoid purge valve is installed on the top cover of the adsorber and, according to the signals from the engine control unit, switches the operating modes of the system.
Fuel vapors from the fuel tank are constantly discharged through the pipeline and accumulate in the adsorber filled with activated carbon (adsorbent).
When the engine is running, the adsorbent is regenerated (recovered) by purging the adsorber with fresh air entering the system under the action of vacuum transmitted through the pipeline from the inlet pipe to the adsorber cavity when the purge valve is opened.
The control unit regulates the degree of adsorber purge depending on the engine operating mode by sending a signal to the valve with a variable pulse frequency.
Fuel vapors from the adsorber through the pipeline enter the engine intake pipe and burn in the cylinders.
Failure of the evaporative emission system leads to unstable idling, engine stop, increased toxicity of exhaust gases and deterioration of the driving performance of the car.
Removing and installing the adsorber
We remove the adsorber for replacement in case of leakage of its housing (can be determined by the presence of a smell of gasoline and during visual inspection), as well as in the event of a malfunction of the canister purge solenoid valve (the defect is accompanied by unstable operation of the engine at idle).
Remove the right front wheel and securely fix the car on the stand.
We remove the right mudguard of the engine compartment (article - Removing the protection of the engine, fender liner and mudguards Renault Duster).
We unscrew three self-tapping screws securing the right wheel liner to the front bumper and one self-tapping screw securing the fender liner to the wing.
Bend the front part of the fender liner and wind it behind the brake disc
Canister location (shown with fender liner removed)
Using a thin flathead screwdriver, pry the wire block retainer
Disconnect the block from the adsorber purge valve connector
By pressing the latch of the tip of the fuel vapor supply pipe to the throttle assembly, we disconnect the tip of the pipe from the valve fitting
We also disconnect the tip of the tube connecting the adsorber to the fuel tank from the adsorber fitting
With a head of 13, unscrew the nut securing the adsorber to the body bracket
Raise the adsorber, removing its stud from the hole in the body bracket
Remove the adsorber assembly with the bracket
With a 13 head, unscrew the nut that secures the bracket to the adsorber
Remove the adsorber bracket
We assemble and install the adsorber in reverse order.
When installing the canister, the large protrusion 1 of the canister bracket should go beyond the rib of the body bracket, and the small protrusion 2 should go into the hole in the body bracket.