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Yes you can. Actually, it's even easier then that, most vacuum pumps have both threaded import and outport fittings and are designed to develop a vacuum on one side and to build pressure on the other (but low pressure- like 35 psi, which it plenty to blow down a vessel), so with a couple of...

FYI- I use VERY strong vacuum pumps at work that generate a near perfect vacuum (practically speaking, not scientifically speaking where "perfect" in unobtainable). I mounted them on 30 gallon air compressor tank/carts and have no pressure issues, so a propane tank should work fine. As far as...