Apparently the refrigerant used in these compressors has a lubricant
So -- i placed a one-way, (flapper-type Brass) Check-valve between the
pump and the holding tank . It seams to hold the Vacuum quite well when
the pump is off, so it must not leak.http://www.valvemade.com/brass_check_valve.html
I un-screw the top on the valve and spray 5-7 seconds worth of WD-40 in the valve, then
close it before turning on the pump. Hold your breath while spraying !!!
((use the red tube supplied with the can of WD-40 so it doesn't atomize in the air))
The air gets sucked From the tank To the pump, so
the oil never sees the tank. I direct the exhaust from the Pump out my window with a
plastic tube so i don't have to smell it. The order of the Epoxy goes out the window
as well, so once i got a seal on the bag, the work-room doesn't stink any more.
This pump has worked just Fine now for nearly 20 years , but i Never forget the WD-40
because i don't want to find another refrigerator compressor.