Air compressor

I got 220 going to it .I'm running a generator.I had the electric motor checked.they guy said it used 20 amps to start the uses 7 to 10 amps.I tried my generator which is 8250 watts with a 35 amp fuse and a 5500 watt that has a 30 amp fuse and it does it with both of them. My electrical box it's wired to a 30 amp.I guess the higher the pressure the more the amp draw!