I just purchased a used 18 gallon bow tank for my 1961 18' Starcraft Holliday and was wondering where in the system to put the pumper ball. Just up from the tank or just down from the motor and is it alright to use the rubber fuel line for the whole 20 feet or so that it will take to do this or should I use some metal fuel line also. Right now I have 2--6 gallon portable tanks one on the right and one on the left and 2 deep cycle marine batteries in the middle I am wanting to move some of the weight up front so I can put on a 10 horse or so trolling motor and thinking that will be to much weight in the rear.