I would put it in the top with a tube to the bottom,reason being if you put it in the bottom and have a mishap such as the fuel line breaking it will empty the tank in a hurry....Lots safer on the top, as far as the fuel line I'd run no less than a 3/8" diameter steel line from the tank to the pump, I've seen copper and aluminum used but I think the steel would have more vibration fracture resistance...