You didn't mentinon what kind of leak, and your symptoms, so..

For What It's Worth:

If the low-pressure fuel return line (braided rubber) leaks, it will leave your injector(s) looking wet and smelling like diesel. It's a simple fix. One meter of fuel line from FastLane or the local dealer, a pocket knife, some patience and the line can be replaced. Then the injectors no longer look wet.

Guess how I know? My #2 started leaking, was wet and I could smell diesel inside the car. The lines just pulled off when I grabbed them, so they were all a bit loose. Replaced all that were loose, and it's nice and dry now.

Best regards,
Jim