No, i'm talking about the one way valve, because that's what you just asked about... 
To test the pump you only need to pop the pipe off. Just set the engine running and see if the pump is producing vacuum, ie put your finger over the end of the port and see if it sticks.
To test the pump you only need to pop the pipe off. Just set the engine running and see if the pump is producing vacuum, ie put your finger over the end of the port and see if it sticks.