the 560SEL has developed a small fuel leak at the rear fuel pumps. Unfortunately I noticed the leak just after I filled up with gas. Might it be possible to clamp off the fuel lines using hose clamps so I can repair the leaks? If so, which fuel lines need to be clamped off? Or do, I have to drain the fuel tank before commencing work?

Also, I understand that normally the copper crush washers are where the leaks are found. Any input is appreciated.