I am completely stumped. You guys helped me out a lot with my previous question here: New gas water heater dripping relief valve, have expansion tank, what gives?
Turns out the expansion tank bladder was filled with water and needed to be replaced. I got a new 2 gallon 100 psi max expansion tank but before putting it on I measured the water pressure at around 100 psi which seemed awfully high to me. When I turned a faucet on the pressure would drop to around 50 psi and I would get a steady stream of moderate pressure. It seemed to steady at around 68 psi so I used that as a good starting point.
Instructions that came with the tank said to install at 2 psi below normal cutoff pressure. Thinking that was awfully specific, I set the air pressure in the new tank to 65 psi and installed it.
I ran the faucets a LOT to make sure I got all the air pockets out but now I notice bizarre fluctuations in my water pressure for the past few days. I have normal water pressure in the basement, acceptable water pressure on the first floor, and virtually NO pressure at all on the upstairs floor, where this was never a problem before.
Leaving the gauge on downstairs the pressure would slowly continue to rise as high as 100 psi at times EVEN AFTER seriously turning the pressure regulator back. When I turn the water on I get a good stream of water then 5 seconds later nothing but a trickle as the water pressure only reads 20 psi when the water is running.
So now I only see four possibilities:
The gauge is broke, there is no flippin way that I have my pressure regulator turned back that far and actually have 100psi build up in the pipes all the way from 20 psi.
The pressure regulator is broke, it is extremely old looking and doesn't have a PSI reading on it, just a hex bolt head that when turned out will decrease the pressure.
The new expansion tank is defective and slowly leaking air into the system causing me to have almost no pressure upstairs
I set the air pressure too high/low in the new expansion tank and it is causing havoc with my internal pressure.
About the only positive thing I can say about everything is that my safety relief valve on the water heater is no longer leaking water so I must have done something right. Maybe I just need to increase the pressure to the house but if my pressure increases to 100 psi slowly while the water heater runs and I have an expansion tank rated for 100 psi then I am afraid I could be creating a dangerous situation.
Any suggestions? I am going crazy over this and I stink because I can't take a proper shower ;)