Hi, we have a V100 and have had pressure problems lately in the house we just moved into last year (it's been fine until the other day). Tom stated that the tank pressure should be 2 psi below the pump cut-in. Our cut-in is about 38-40 psi but the tank pressure is 60 psi (the previous owner said this is what they kept it at and it worked fine). I've done all the tests as described above and it seems the tank (bladder) is fine but still no pressure in the lines. I've tried adding more air, which keeps the pressure but then the pump kicks in too often, and reducing which results in lost pressure and it takes forever for the pump to kick in. I guess the question is, what would you consider the 'average(?)' working psi and is there such a thing?