1987 fuel lines

I have a R&R(remove and replace) questions on the fuel lines for my 87 305 4bbl

I think one of them is leaking from the tank to the fuel pump. I got under the car and saw them come out of the tank then go underneath this cover/floor board looking thing. then i dont see them again till the fuel pump(it doesnt seem to leak from after that, its dry there and only smells in the rear of the car)

Does that floor piece thing(and if it does how) come off and give me access to the fuel lines to replace them if its them leaking and not the tank?

I don't remember there being any type of cover for the fuel lines. As far as I can remember, theres once on the driver's side for the charcoal canister, and one on the passenger side for the main fuel feed.

Some of the lines are routed within the passenger frame rail, could this be what you are referring to?