I have a 40 gallon hotpoint gas hot water heater in a foreclosure I bought that set for about a year empty. I had hot water pouring out a line under the house so I capped it (stupid I know). Well after talking to a home inspector he told me that it was probably my pressure relief line and my t and p valve was probably bad so I replaced it and yet still hot water is shooting out the line when I turn my water on. For a few hours the water lines in my house just shook really bad and then the valve opened up. I have no idea what to do now. Do I need to buy a new hot water heater or is something else going on?