I borrowed my dad's air compressor and when I plug it in the garage it will try to start and trip the breaker (20A breaker and it seems fine as I can run an number of other things on it without tripping). It sputs and sputters to try to get going, until it trips the breaker. However if I bleed the air off in the tank, it will start up fine and run until it hits the high pressure shut off.
I am thinking that the starting capacitor on the motor is getting weak and this is showing when starting against the pressure in the tank. I would think that the "run" capacitor is fine as it runs fine once it starts. I think I will stop by Grainger's to see if they have a new starter capacitor on the way home.
What are other's thoughts. Am I chasing the wrong thing?