Ford F4UZ-9E453-C Reservoir - Vacuum

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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.

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.

In carbureted engines, vapor from the gas tank and sealed carburetor is routed to the canister through valves like the bowl vent solenoid and thermal vent valve.

To maintain Thermactor system components like TAB/AIRB or TAD/AIRD solenoid, you should disconnect the battery, locate the solenoid(s) on the firewall, unplug the electrical connector, label and detach vacuum hoses, remove the solenoid/bracket screws, and detach the solenoid(s).

The EVAP system is designed to trap and store fuel vapors that evaporate from the fuel tank, throttle body, and intake manifold during non-operation or idling, store them in the charcoal canister, and then route them into the combustion chamber to be burned during engine operation.