Dick. on my boat their are 2 lines for fuel. In feed, and return its been said both have to be correct for the engine fuel injection system to work right. Their are no quick/easy connects ect. between tank and motor. only hard connections at fuel bulb and shut off under deck. How and where would you cut fuel lines for an external tank plus add quick connects. Second what needs to be done to the second Return fuel line so that the engine runs.