PSI for built in Inflator kit?
 

I'm thinking about getting an impact wrench, but I don't have a standalone air compressor, and I am wondering if the built in air inflator in my 2003 Venture is strong enough to power one?

I'm not looking for anything grand, just something that will go to maybe 300-500 ft/lbs. so I guess I maybe need about 100 PSI?

I cannot find the information online anywhere.

Welcome to the forum.:) It's the volume that matters more than pressure. Consider an electric impact wrench.