Originally Posted by Diesel911

If you want info on what Electric Vacuum Pumps to use look in the Electric Vehicle threads where they have converted a regular car to an Electric.

The most available one that does the Job (since it is made to operate to supply Vacuum for the Brake Booster) is the Comp Cam Vacuum pump that is sold by a lot of racing sites and eBay. The issue is that it cost as much as a stock Replacement Vacuum Pump and the Electric Vehicle sites say the pump us noisy.
The other new Vacuum pump alternataives mentioned at the Electric Vehicle sites are also expensive.

I bought a Thomas 12 Volt Vacuum Pump to try your idea but have never gotten around to it.

Anoter issue might be that the stock Alternator my not put out enough amps if all the electrical stuff in your car is runing.