Smog Pump Problems

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Within the last few weeks my smog pump has been making some noises. First it started off as a rattle sound. I though it was the exhuast or something. I get home and find out its coming from the smog pump. The smog pump pulley has been bent forever and never been a problem. Its not bent bad, but you can see it wobble a little bit. Well now there is a rattle sound coming from it like the pulley is hitting something or loose. But it is not hitting anything and isnt loose at all. I believe the sound is internal. That rattle sound went on and off for a week or two. Now sometimes I hear a humming sound. Similar to something rubbing on a belt. When you hit the gas the sound increase to a point then goes away till the engine speed slows down. I believe this is also coming from the smog pump. Am I missing something, anything else to check?

Anyway have any ways to figure out what is wrong with it?

Should I just get a rebuilt smog pump (Cardone $40-80) and new pulley?

Can I find the new pulley at a gm dealer?

What about a new smog pump from the dealer, cost?

Could the diverter valve be the problem?

If so I know I can get a GP Sorensen diverter valve for $25-30.

How much for a diverter valve from a gm dealer?

Thanks for the help, and yes I have to keep my smog system.