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Home >> Buick >> 1987 >> Electra Base >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Evaporation System >> Operation >> Thermostatic Vacuum Switch
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Thermostatic Vacuum Switch

Thermostatic vacuum switch is mounted on the intake manifold to sense engine coolant temperature. This 2-port, temperature operated vacuum switch, opens when temperature reaches 170°F (70°C) to allow fuel bowl vapors to escape to carbon-canister.

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