I little history first,
I have a 2500 gal. water tank (I have my water trucked to me) with a 1/2 hp jet pump atop a 15 gal. bladder tank purchased from ***** ($300 in 1996 and still today same price).
The tank came with a 40 psi precharge. The end of 2004 the pump started surging and I discovered that the precharge was gone (still don't know why) so I shut it all down, drained it and re-charged the bladder but the water supply isn't seemless anymore, it pumps up but during use you can tell when the pump gets ready to turn on again because the pressure drops a lot and then surges back to normal and doesn't seem to act funny again while using it (like in the shower). This is not my problem.
This morning all of a sudden in the shower the water started spurting air like it does after you shut off service and work on the pipes and then restart service. I haven't done any of these things. It is more of a problem on the hot water side but it happens even outside with the water hose so it is not water heater related.
I have inspected the water supply pipe between the tank and the pump and there is no leak to indicate that the pump could suck air from there.
I have inspected the air bladder to see if that air was leaking into the system but of course there isn't enough air in there to cause this much problem, it would have all leaked out long before now.
The only thing I noticed is that when running the water and watching the pump pressure gauge, I heard what sounded like air pushing through one of the the lines just before the pump kicked on. This is out at the pump and not in the house. I do not know which line was making that air pumping sound but am sure the cause of that is the cause of my problem.
I am not low on water (just wanted to eliviate that question).
I do not know what to do here.
Could the pressure valve be bleeding a ton of air into the system just before the pump kicks on?
Could the pump be somehow cavitating at that point? If so, where would it be getting the air from?
I am talking about a lot of air spurting but it does subside after running the water a while.... just that air sound at the pump before kicking on puzzles me.
Any help is greatly appreciated and thank you in advance for any help anyone can provide.
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