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Home >> Chevrolet >> 1990 >> Forward Control 6.2 J, Automatic, 3L80-HD/M40 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel Evaporation Control >> Fuel Tank Pressure Control Valve
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Fuel Tank Pressure Control Valve

Install a short piece of hose on valve inlet tube (fuel tank side) and blow into hose. Diaphragm should pop open and air should pass through valve. If valve does not open, fuel tank pressure control valve should be replaced.

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