Hi. I replaced my pre-pressurized diaphragm cold water tank along with the pressure switch. I went from a 20 gallon tank/ 20-40 switch, to a LPT 36 gallon tank/30-50 switch... adjusted tank pressure to 28 lbs before turning on pump or releasing any water from the house pipes. The switch was wired correctly and I tested it... pump turns on! But I am not reading any pressure on the system nor getting any water from anywhere. Can you help me trouble shoot?

This is a bit of a long shot, but was there a check valve in the line when you took things apart and reassembled them. Could be if that is the case, you installed the check valve backwards. I assume the obvious that all valves etc. were opened back after adding new tank.