Mazda Trucks 1987-1993 Repair Guide

Evaporative Emission Canister



See Figure 1

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Fig. Fig. 1: Location of the evaporative canister near the firewall on the right side fender well-MPV shown

The evaporative canister is located under the hood in the engine compartment and is designed to store fuel vapors and prevent their escaping into the atmosphere. On early models, when the engine is not running, fuel that has evaporated into the condenser tank is returned to the fuel tank as the ambient temperatures rise and the vapors are condensed. Later models do not have a condenser tank. During periods when the engine is running, fuel vapor that has not condensed in the condenser tank moves to the carbon canister. The stored vapors are removed by fresh air through the bottom of the inlet hole and passed through the air cleaner to the combustion chamber. No maintenance or service should be required, except in the case of damage or malfunction. The canister should be inspected for damage or leaks at the hose fittings. Repair or replace any old or cracked hoses. If either condition should exist, simply replace that component.