Hyundai Coupes/Sedans 1986-1993 Repair Guide

General Information

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See Figures 1 and 2

The function of the evaporation control system is to prevent the emission of gas vapors from escaping into the atmosphere. When fuel evaporates, the vapors pass through vent hoses to the charcoal canister where they are stored until they can be drawn into the intake manifold. All vehicles are equipped with the charcoal canister for the storage of fuel vapors.



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Fig. Fig. 1: Evaporative emission control system-carbureted vehicles

The evaporative emission system for feedback carburetor engines consists of a charcoal canister, a bowl vent valve, a vacuum operated purge control valve, a thermo valve, an overfill limiter, a fuel check valve and a fuel filler cap equipped with a relief valve to prevent the escape of fuel vapor into the atmosphere.



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Fig. Fig. 2: Evaporative emission control system-fuel injected vehicles

The evaporative emission system for multi-point injection engines consists of a charcoal canister, a computer controlled purge control valve, an overfill limiter, a fuel check valve and a fuel filler cap equipped with a relief valve to prevent the escape of fuel vapor into the atmosphere. On multi-point fuel injection engines, the valve is opened when the Electronic Control Unit (ECU) determines that the conditions are correct.

 
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