You'll need to verify that the tubes go all the way to the bottom of the tank.
You can do this by trying to draw fuel out when you have about 1/8 tank of fuel.
If you can get a steady flow, then you can use the tube, if not then you can't.
Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)
"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"