How to repair leaking shut off valve

[Rockwork]

On my CB750F the shut off valve leaks only when it is on. It's not from the connection to the tank or the hose connection, but looks like it is coming out of the back of the valve.

Is there a way to repair it or do I need to replace it?

Thanks.

[Lucky 1]

You will have to tell the forum members what year of motorcycle you are talking about.

If you cannot rebuild it you will need to replace it.
First step is to remove the gas from the gas tank and then remove the tank from the motorcycle.
Be careful if you are in a garage with a gas hot water heater!