I'm not clear on what you are saying, terrace. The suction line (the one that supplies fuel to the carburetor) always has a weighted end-fitting inside the tank, with a built-in fuel filter, so it will lie at the bottom of the tank and draw out the very last of the fuel. Most times you can pull out the grommet where that line goes through the top of the tank, and the hole is big enough to draw out the hose and its weight/filter. If you can't fit it through the grommet hole, you have to pull it off the hose by using pliers through the fuel filler hole. There will also be a vented fuel tank cap or an air entry line going to the fuel tank, to allow air into the tank to replace the fuel drawn out.
Can you show us a picture or two to clarify the problem please?
