What engine do you have? I don't think there are any hoses running into the cats.
This is the 4.4 V8
the 4.0 V6 is similar.
Number 3 is the cat. 7 Silencer - Front, 8 - Silencer - Centre, 9 - Silencer - Rear.
Here is the fuel system for 4.4 v8, again v6 is similar:
10 - Pipe - Fuel pump to engine (feed)
11 - Pipe - EVAP purge valve to charcoal canister
I would think if it was 10 leaking it would be a very bad leak as the line is high pressure (65.25 lb/in²). Given it's leaking on your cat there is pretty good chance of a fire, so I wouldn't drive it until you get it fixed. So I would think it's either one of those lines, possibly it's only leaking at the connection to fuel rail. Take off the engine cover and get a light and a mirror and have look at the back of the engine.