Ans: Yes, it can run the impact wrench. But, in my experience, you should use a 20-gallon air compressor. Because 6-gallon tank size with 2 to 3 CFM @ 90 PSI is the minimum requirement and it will only cause you continuous delays in your work. The recommended power for running a 1/2-inch impact wrench is 4 to 5 CFM @ 90 PSI with larger tank storage.