Originally Posted by maniac57
Thats why I mentioned leaks...it must be able to gravity drain or it will not feed the carb.
These saddle tanks are mounted under the engine, which SUCK fuel up to its carburetor. Return lines can be used as a vent. In your situation, your engine will siphon AND suck fuel to the carb. That can be controlled w/a tee fitting with the stock tank.
A simpler solution would be to replace your peanut tank with a 4-liter peanut tank. Same mounts, same single fuel line and twice your driving range.