Fuel Evaporatijn System; Air Vent System; Mazda Rx7 Check And Cut Valve - Mazda 1983 RX7 Service Manual

ARTICLE BEGINNING
1983 Fuel Evaporation Systems
MAZDA ROTARY ENGINE
RX7
DESCRIPTION
System prevents escape of fuel vapors into atmosphere.
Components consist of a non-vented fuel tank with integral vapor
separator, vapor valve, check and cut valve (located at fuel tank),
charcoal canister, air vent solenoid valve, purge valve and
connecting hoses.
OPERATION
When engine is not running, fuel vapors formed in fuel tank
pass through vapor valve. Those vapors that do not condense to liquid
fuel are routed through vent lines to charcoal canister where they
are adsorbed. When engine is running, filtered air is drawn into the
system through the air cleaner, mixed with gases and vapors that blow
by the rotor and are drawn through purge valve and into intake runner
to be burned. The purge valve operates as the PCV and check valve.

AIR VENT SYSTEM

An air vent solenoid on carburetor prevents carburetor bowl
evaporated fuel from collecting in the intake manifold after hot
engine shut off. With ignition off, the solenoid closes an air vent
in the carbon canister, trapping the evaporated fuel.
Fig. 1:

Mazda RX7 Check and Cut Valve

FUEL EVAPORATION SYSTEM
Article Text
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 04:58PM