Jaguar Repair: Isolating XJ6 fuel tank, return valve, fuel tank

Question
I would like to isolate the right (passenger side)fuel tank on a 1987 XJ6 because it leaks. I know there is a fuel return valve that is probably bad causing fuel to go back into (maybe) both tanks instead of the left tank I want to run on. Is there an easy way to do this other than replacing the bad return valve (which I haven't been able to locate).

Answer
The Valve is located in the passenger wheel well. Please go welshent.com and download a parts catalog. You can also buy parts there. The catalog will also show you the location of most parts. Also please read some of my previous answers to similar questions. Sam.