Ford EOAZ-9D653-A Reservoir Assembly

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The system for emission control prevents the fuel vapors from being released into the atmosphere. It is a sealed carburetor bowl and a check valve fuel tank filler cap which helps have a "closed" fuel system. A vapor relief valve integrated into the fuel tank controls vapor pressure while charcoal canister is connected to the sources of vapors. The engine purges the canister off vapor by feeding it to the engine when it is running. In carbureted engines, the canister gets vapor through valves such as thermal vent valve and a bowl vent solenoid. On the other hand, for fuel-injected engines, outlet of canister connects with an electrically activated canister purge solenoid controlled by EEC PCM for combustion of vapor.

First of all, the Evaporative Emission Control System (EECS) captures fuel vapor from the fuel tank, throttle body, and intake manifold. It consists of a charcoal-filled canister connected to the fuel tank, a ported vacuum, and an intake manifold vacuum. When the engine is off, the system holds fuel vapors in the canister. During engine operation, a purge control solenoid is opened to release the fuel vapors into the combustion process. A faulty purge control solenoid, damaged canister or hose problems can result to issues like poor idle, stalling or driveability problem. If necessary, the technician checks if there are any cracks in the canister and replaces it accordingly.

To begin with, disconnect the battery so as to perform maintenance on the EGR system components. To install a new O-ring during installation, unplug the electrical connector from the EVP sensor, remove the mounting bolts, and then detach the sensor. Disconnecting the battery is required for EGRC or EGRV Solenoid(s). They can be found on firewall, you will need to unplug the electrical connector, label and detach vacuum hoses, and remove the solenoid if it is held by bracket screws. EVR solenoid requires removing the solenoid, unplugging the sensor harness electrical connector and vacuum hose, and detaching the battery cable. Detach the vacuum line and mounting bolts after unplugging the electrical connector from EGR valve position sensor of the EGR valve. The valve should be removed after taking out the threaded fitting for the external exhaust supply tube (if present), unscrewing the mounting bolting, and removing a vacuum line. The gasket should also be replaced. When substituting an EGR valve without a position sensor; one can transfer the old one to fit with a new O-ring. Disconnect the battery before dealing with TAB/AIRB or TAD/AIRD solenoid(s) on the firewall then unplug the electrical connector from the solenoids located there then mark before removal of their vacuum hoses and solenoid/bracket screws. Labeling and disconnecting hoses are done when replacing faulty components in air pump and control valves on MTA systems before reattaching hoses.

To maintain the EVR solenoid, located on the engine-mounted solenoid bracket assembly, you need to detach the battery cable, unplug the sensor harness electrical connector and vacuum hose, and remove the solenoid.

Yes, further details about the evaporative emissions control system are provided.

The purpose of the Evaporative Emission Control System (EECS) is to capture and store fuel vapors evaporating from the fuel tank, throttle body, and intake manifold.

The charcoal canister is accessible from below on most models.

Further diagnosis and repairs on the EVAP system should be done by a qualified automotive repair facility.

Label the hoses, then detach them and remove the component.

Components like the charcoal canister, canister purge valve, canister purge solenoid valve, carburetor fuel bowl solenoid vent valve, carburetor fuel bowl thermal vent valve, and combination thermal vent solenoid valve should be regularly checked.