you can answe rpost from feb 7 or answer this new info. looked at expansion tank these are the the numbers/amtrolmodel #ST-5. precharge 40 psi .max pressure 150 psi .max temp 200 degreses.said before took offf tank pumped to 13.5 lb. turned auto fill counter clock wise one and a quater turns. it stil is at 30 psi with no drips from prv. you think i should pump expansion tank to 40 psi and reset auto fill back to origanal position. or you think the pressure gauge is not working right?to jadusha.i said i took off tank emptied a little water from it.it did not leak water when i pumped it to 13.5.