Tank Pressure Control Valve
Remove rubber hoses. Apply vacuum to pipe "A". See Figure . Blow into pipe "B", and check if valve is open. With pipe "C" capped, apply pressure to pipe "B". Check that air does not pass through.
Remove rubber hoses. Apply vacuum to pipe "A". See Figure . Blow into pipe "B", and check if valve is open. With pipe "C" capped, apply pressure to pipe "B". Check that air does not pass through.