Here's the scenario. I have a 3' wide, 30' deep hand-dug well (a real, genuine 'stone-walled' well -- a historical relic on it's own! :) ) It currently has plenty of water in it -- I've seen the water lower than it is now.
A few months ago I replaced the old galvanized tank since it was leaking through. We put in an 80gal bladder style tank. The result was amazing (going from 4 seconds on, 6 seconds off to 3-4 minutes off, 1 minute on while running the garden hose full).
The problem is I've noticed air in the system. The air only occurs when the pump is on. I've looked at the pipe in the well, and don't see any "air bleeders" that were supposedly used to keep galv. tanks from saturating. Our old galv tank was leaking at the inlet, so any air would have leaked out long before being drawn into the house system.. It's been many months since the new tank was installed, so it can't still be air purging from it.
The well sits about 20' from the house. In the basement I have a 1/2hp shallow well "Red Jacket" internal jet pump, in a single-line configuration. The pipe going to the well from the pump is 2" PVC. The fittings from the pump down look something like this: Pump (made in 1996, so the sticker says) 2" evil galvanized male-male (2" length) fitting 2" check valve (Not sure about material - isn't rusting on the exterior like the galv.) 2" evil galvanized nipple 2" Black PVC pipe, runs about 15' along the basement floor(dirt), and then the 20 feet to the well.
In the well: a 2" PVC 90-degree elbow about 4-5' from the surface where the pipe from the basement enters and then a length of PVC pipe running vertically down the well. What is at the end of this pipe? I'd hope there would be a foot valve there, but since the previous owner was the king of shortcuts, the duke of half-finished jobs, and president of shoddy work in general I wouldn't be at all surprised if there isn't one. We do get debris in the water, which might indicate there's no screen there.. My gut feeling is that the check-valve at the pump was a work-around for something, but I'm not sure what..
I suspect the fittings on the suction side of the pump, they're galvanized. I also wonder if it could be the pump it's self, or if I've missed something obvious. It's impossible to listen for any leaks since the pump is too loud. Any water leaking might not be noticeable since there is a ton of condensation on the plumbing. I'd tear it all apart right now, except I'm afraid that I won't be able to undo the rusty galvanized fitting at the pump, and if I do, that I won't be able to re-prime the pump if there is indeed no foot valve.
Can anyone think of anything I've missed that could cause air to get into the system?
Thanks,