I could be wrong but I think your friction fit lines will be a big mistake. Once the oily fuel and suction from the pump are there I think they will leak. Not only that, I suspect the thin plastic wall of the tank will cut into the lines in short order. Brass tubes through a rubber stopper or thread in fittings glued into a tank are tried and true methods for years. If it could be as simple as friction fit through a tank I'd suspect that would be the norm already.