I have an airablo 8cfm electric vac pump with cooler on it. Last year I had problems with it only pulling 22 inches of vac it's about 8 years old and has pulled 26 inches until last year.Oil seems to flow through it and relaxed the filter ever year. So recently I got a new rotor new vanes bearing and seals, replaced everything today and its still only pulling 22 inches of vac then drops to 20 dead headed. I'm going to check for leaks on the pump in the morning after chores but I was wondering if anyone else is has had this problem and how the fixed it thanks