Thanks everybody. I ordered a smoke/leak detector listed above. One step at a time, check the current pump for ware, seal the new motor well, go from there. I found a 4.5 inch pulley available from GPZ that fits, speed increase of 11 percent. Try that . If I don't t reach decent vacuum of +14 inch, the expensive fix is a 4 vain enhanced, which is supposed to reach good vacuum when staged.