Where can I get a smog pump for a'78 Cad. Seville in Sacramento or Bay Area?

Answer 1

Charles—
If you cannot locate a pump, or get the one you have rebuilt (Genex, Apex etc.) there is a parts locator number you can call to locate any AVAILABLE emissions related component.
Your SMOG tech should have informed you of this number. You can call the locator, they will give you a number or two of people who have them, you contact the vendor, if you are satisfied with the price and (Warranty?), pay for it, they ship it, and you usually have it in less than 5 days.
The number is [phone].

Happy Motoring

Answer 2

Try posting a want add on e-bays "Want It Now" page