hi, i discovered that i have a fuel leak on the top of the fuel tank. it looks like it is coming from the middle hose where it attaches to the fuel pump module. but when i push on the lines (with a stick) all 3 are still connected. so i guess dropping the tank will be my next move. one thing i am not understanding is why there are 3 lines. there needs to be a pressure line going forward, and a return line coming back. but what is the 3rd line for?

what is the black box in the drivers side rear wheel well? i see 2 fuel lines going to it, near as i can figure out, it looks like some kind of fancy vent system.

Third is the emission'* line, and box is probably the charcoal canister......