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Home >> GMC >> 1987 >> Forward Control 5.7 M, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Evaporation System >> Operation >> Auxiliary Canister

Auxiliary Canister

On models with dual fuel tanks, an auxiliary canister is added to primary canister to increase canister capacity. Auxiliary canister is connected in line to purge air inlet of primary canister.

Vapors overflowing from primary canister are stored in auxiliary canister. During purging, excess vapors are routed to intake manifold for burning in engine.