"johnnyzero" wrote in message
1) allow it to run a light-duty liquid pump - for pumping small
quantities of water or whatever.

Yes, I've seen them. The one in particular I saw was not very impressive
and an electric ump would have been better.


2) turn the compressor into a reasonably-powered vacuum pump - for
"dry" applcations like evacuationg a/c systems or watever.

No, it would no draw a very good vacuum.