Well Water has Air Bubbles
The air bubbles may possibly be from a leaking bladder in the pressure tank, or there could be a fitting leak on the suction (well) side of the pump sucking in air. Most likely it's a bad tank bladder.
Turn the pump off or unplug it, and drain the water pressure down until it stops running out.
Now, check the pressure in the tank with a tire pressure gauge. It should read (and hold) two psi below the pump cut-on pressure (i.e. 20 psi cut-on to 40 psi cut-off should have a tank pressure of 18 psi when the pump isn't on and the water pressure is drained down).
If the pump is set at 40 psi cut-on/60 cut-off, the tank pressure should be 38 psi. If the tank pressure is too high, bleed the air pressure off to the 2 psi below. If it is too low, air the tank back up with a portable compressor or air tank.
If water spews out of the pressure tank air valve, the bladder is shot and you need to replace the pressure tank, which is what I suspect will solve your problem.
If you need to know how to prime the pump later, just ask.
Last edited by Mike Swearingen; 07-21-2010 at 08:02 AM.