Air compressor: rebuild or replace pump?

[pwdcougar]

I have an upright Craftsman air compressor that doesn't build pressure as quickly as it used to. Thought it was the filter but swapping in a new one didn't change the recovery time. I used to be able to run my whiz tool (die grinder) or my sandblaster and it would run, build up pressure and shut off. Now the sandblaster and the whiz tool lose power and the compressor runs constantly and doesn't catch up.

I can get a complete brand new pump for about $190 or a ring and seal kit for about $90. It just doesn't seem right to spend the extra 100 bucks but considering I would get the whole pump.............

Paul