I have a '91 Buick lesabre. It has a fuel leak below the driver door. There are 5 rusty metal lines running parallel .... the center being the largest of the lines and the one leaking the fuel. What are the other 4 lines? There are 2 on each side of the larger center one. It is wonderful living in the rust belt.
Only two are fuel lines, the main feed to the engine and the return line from the engine to the tank. One other gas tank line will be the EVAP line for sending gas tank fumes from the charcoal canister to the engine's intake manifold.
I think the other lines would be your brake lines to the rear wheels.
YouTube has many videos on repairing rusted fuel lines. Most people use the lines made of plastic in their repairs-takes special fittings though. These plastic lines have become very common now. In fact my '92 LeSabre has mostly plastic lines.
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