Need some help with the vacuum wipers on my 54 3100. The pins that hold the wipers move when the wipers are not in place, very little movement when attached. Looked under the dash and the vacuum line is attached but there is a second hose connection pointing down from the pump. When I cover the hole I feel vacuum and when I release the hole the pump will move but then stops until I cover and uncover the nipple hole. Is there supposed to be something attached to this hole?
