After installing an internally regulated alternator (Powermaster 100/70 - works great) I took it for a test drive to make sure everything was back together and working. While driving everything looked good electrical-wise, but when I shut it down and got out I noticed fuel dripping from a splice in the fuel line. I replaced the hose coupling, but after tightening the clamps it was still leaking. I finally figured out the hose was so old it was cracking as I tightened the hose clamps. I ran new fuel line, but as I was attaching one end to the fuel pump I noticed something odd. As I understand it, the second rubber hose is the return line that is supposed to run back to the tank. In this case, the return line coming out of the pump has been capped off. The hose from the tank is fastened to the capped return hose, but it is not tied in to the flow path. What at first looked like a "T" connection is actually just the return line clamped on to the side of the capped line. The return line is essentially a long open fuel tank vent. Is there any reason why the return line would have been capped off like this? Should I reconnect the return line to the tank, or just leave it alone? It runs fine like this.