check valve,.... huh? I have no check valve i guess... There is just a little rubber coupler where you say the valve should be... And another thing, when I connect my vacuum hand pump to the hose running under the plenum and turn the motor on, the vacuum rises and holds at about 17-18hgs... Yet with the engine off It wont hold the vacuum. 17-18 hgs isnt enough to function the actuators??
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