How is air getting into my lines?

When the shop charge is 6 or 7 or 8 times what the customer's wages are, I ain't got all afternoon. I got two weeks to two months work ahead of me at all times. People come to have me fix their stuff. Not some " less than stellar,un-informed", upstart, novice.That's why I used to get the big bucks; I know how to get things done, and in a timely fashion, and it don't come back. And I make tools too.The kind that work.
My bosses got rich off me, and I never had a slowday.I fix everything. I can overhaul nearly anything on your pre EFI; car, pick-up, farm-truck, and from the flywheel back, your hiway tractor, your ditch-witch, powershift anything less than 6 ft tall, your outboard motor,your snowmobile, ATC, motorcycle, golfcart, lawnmower, chainsaw or bicycle. Your sewing machine your electric tooth brush and your hairdryer. I can rewire your house,install your plumbing, heck I can build the whole house.Or your garage.or your garden shed.I can build your kitchen cabinets, install your shower and hack down your dead trees. I can drive just about anything with rubber tires, and probably fix it when it breaks. I do engines, trannys, and diffs. I do brakes suspension and steering.I do electrical, and hydraulics.
I don't cook,clean or vacuum. I have a helpmeet for that.
I am a mechanic, oldschool kind.
OOPs I was a mechanic.

I'm semi-retired now, so leave me alone, it's past nap time, lol