Thanks for the reply, what I was saying is my Mityvac will not operate with the pump handle raised above the tank, it will not stay down after the last stoke of the pump, to get it to stay down I have to tie the handle in the full down position with a string, otherwise it will slowly rise to its full height and not suck oil, is this a fault in the Mityvac or its normal mode of operation, then manual did't say anything about tieing the pump handle down.