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If engine runs fine and thats only problem the quick is a fuel shut off valve install and turn gas off before shut engine off or I think it is fuel float in carburetor that will need to be set or replaced.
Find the cold water supply pipe to the tank. Most are labeled, but if unsure - turn on the closest hot water faucet and feel the temperature of the pipes connected to the water tank. Follow the coldest pipe back (moving away from the tank) until you reach the first shut off valve on that pipe and shut it off completely. No more cold water will fill the tank and cause water to spray / leak from the pipe. There is no need to shut off the gas really, as it is controlled by the temperature sensor on the tank - but if you insist, you should find either a flexible pipe - or a black iron pipe that enters a controller. Most have a dial marked "OFF" "ON" & "PILOT". Simply twist the dial from ON to OFF and the gas will be shut off. Good luck!
It sounds like the needle valve in the carburetor is not seating properly to shut off the fuel. A badly worn needle or dirt/debris in the needle seat area can cause this. Disassembly of the carb and a good cleaning will be required.
If the GCV engine is tilted with the carb. down, it will leak gas. If it is leaking gas setting level, this indicates the float/needle is not shutting the gas off properly. Would need to disassemble carb. and check the float and probably replace the inlet needle. The float hinge may be "varnished" and not allowing the float to "move" and shut off the fuel coming into the carburetor. Hope this helps in some way.
I think the leaking gas at your carb is caused by the float or inlet needle that controls the proper amount of gas going in the carb. If you remove the float bowl from the carb to get at the float, remove the float and check to see if there is gas inside inside the float by shaking it. The float is very light as you can see, so a little bit of gas inside makes it not control the gas level at the proper level. You can also wipe the float dry, then move it around and if there is gas in it you will see a wet spot. If leaking install new one. It could also be the inlet needle sticking and allowing too much gas to get in the bowl. When gas leaks out of the carb that way that is usualy the problem. I hope this helps you out a little. Best regards and good luck. I will gladly answer any questions.
There is a check valve on the tank where the line from the pump goes to. It should also have a smaller line running to the pressure switch. If the valve or spring inside is broke or stuck it will leak as you describe. You need Campbell Hausfeld part number CV221502AJ.
The thermostat probe on most residential water heaters is part of the gas valve. The thermostat is a non replaceable part of the gas vale and if your t-stat is bad you will need to replace the gas valve also.
This is generally not a very hard job just start off by shutting gas supply valve to off position.Disconnect main gas line to burner,line to pilot light, and thermocouple from gas valve. Remove pipe fitting from gas valve and use large pipe wrench to loosen gas valve.
Before you loosen gas valve you will need to shut water supply off and drain water from tank.MOST WATER HEATER GAS VALVES ARE PRETTY STANDARD ITEMS AVAILABLE AT MOST HARDWARE STORES. Just make sure you purchase valve for the type of fuel you have,such as l.p. or natural gas.Remove gas valve by turning counterclockwise. Use teflon tape or pipe joint compound on all threaded connections for reassembly. Hook up gas line,burner supply line,pilot and thermocouple lines. Refill tank and check and check for leaks. Light pilot and turn gas control to on. Set to desired heat setting . Also check all gas fitting for leaks. Good luck. Thanks