I want to evacuate my AC system to check for leaks before I put that expensive R-12 back in it. I have asked around of my friends and no one has a vacuum pump. I thought I'd buy one but there are so many variables that I couldn't decide. I see one that pulls 2.5 CFM and a better one that pulls 4.5 CFM. Anybody shed some light on this subject?

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1983 300 SD. 157K.
1964 Studebaker GT Hawk
1972 Corvette, Bought new
2007 Toyota Tundra
2007 Toyota 4 Runner
1993 Toyota Sequoia
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