When checking the tanks air pressure water squirts out of the valve. Does this mean the tank is bad? I assume there is some type of bladder inside thats leaking.

Normally for adding air to the bladder. Only add air if your pressure of low. Look at your paperwork of on the unit to see what it should be. The bladder pushes water out of the tank.

Check storage tank. The tank must be emptied of water and 7 psig air is applies to Schrader valve on bottom. of tank. It is not uncommon for tanks to lose pressure, however there are time s where the bladder devolve a hole and ends up with water on both sides.

Water that goes in to this tank comes straight from pump, check the foot valve on your well might be bleed water back into well. Also check the air bladder on the tank. Make sure it has proper inflation

Assuming this is not a steam boiler, your boiler probably has one or more of the following problems; (1) bad vent(s) not stopping after it purges air, (2) bad vent(s) that are blocked and can not purge air, (3) air bound caused by not inspecting #2 (and replenishing water, if needed) on a regular basis, (4) a water leak (low water cut off will prevent boiler from firing up), or (5) a defective supply water valve, or defective supply side check valve, or blocked water line, especially when sediment can easily foul the supply line. We need to look at the expansion tank. Is it water logged from a defective bladder? Is the Air Separator (near the X tank) operating properly? Similar to a vent, but larger, it can get clogged up and cause air to be trapped. Since the boiler will not start, you obviously have a low water condition. Solve that problem and you'll be warm again.

The easiest way I know of is to remove cap from air valve on top of tank and check pressure with tire gauge.If you get water out of valve then air bladder is bad and tank will need to be replaced. If you don't get water but no pressure then reinflate to 3-5 PSI. Hope this helps. Thanks

you are correct....the rubber bladder inside the tank has leaked by and filled the expansion tank. it will need to be replaced and you also may find boiler or water heater relief valves may blow off until its replaced

The bladder has probably folded and blocks the exit so you don't get a complete drain.

No, if water comes from the air port the bladder in the tank is ruptured and the tank should be replaced.

sounds like the bladder tank at the well is ruptured this will cause pressure surge, and pump short cycling, and needs to be replaced asap.

Sounds like a well fed system with a pressure tank that has lost its air charge. Check for a water tank with a tire pressure type stem fitting, should also have a pressure gauge. Most newer tanks have a rubber diaphram inside to keep the air and water from mixing, but a lot of older ones don't and the newer ones will develope a leak that will produce the simpoms you describe. Try adding a few pounds of air pressure to the top of the tank and check for leaks. Warning: Compressed air can escape explosivly if the tank is badly rusted out but if your water pressure goes to 50# without the tank leaking, it should be safe to add up to 25# of air. The air charges the water system and allows the pump to shut off until enough water is used to lower the pressure back to set points on the control switch. It's not a good idea to adjust the set points on the switch unless all parts in the system have been checked for safety to the new pressures.