Take the 2-minute tour ×
Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. It's 100% free, no registration required.

The faucets have been hissing of air for the passed few months, and it has been getting progressively worse. It is usually worse in the morning when we get up and in the evening when we get home.

We have a Well Mate VM series tank. At first I thought maybe the bladder failed and the air was coming from the other side of the bladder. So I knocked on the tank and it sounds hollow on top to me.

Then I thought the air bubbles were coalescing at nearby high point during lack of use.

Then the other day I was near the tank when I heard the air leave the tank and travel through the pipes.

Any ideas what may be causing this?

share|improve this question
add comment

2 Answers 2

Possibly a leak on the suction side of the pump pulling in air.

share|improve this answer
add comment

It's possible it's the pressure tank. To check the pre-charge, turn the pump off, and then open a faucet to let all the water out. Check the pressure in the tank using a tire pressure gauge (there is a valve on the top). This should be 2-10 PSI below the "start" pressure of the pump: eg, if your pump comes on at 40psi (on at 40/off at 60 is the most common setup), the pressure tank pre-charge should be 30 to 38psi. If it's lower, fill it (and keep your faucet open). If the bladder is broken, you won't be able to fill it and there will be air coming out of the open faucet.

It's also possible something is wrong with the check valve and air is getting in the line from the well to the house. To check this, turn the water off to your house (usually there is a valve somewhere after the pressure tank) -- it's essential to isolate the pressure tank from the rest of your house to do this test. Run the pump until the pressure tank is full and it turns off, and then watch the pressure gauge. If it's slowly going down, you are losing water somewhere either due to a break in the pipe, or a broken check valve.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.