Post #3 is going the right way. You want to make SURE the source (tank) is clean and everything associated with it is in good shape. If it was mine, I would remove the tank and have it cleaned by a competent radiator shop. That's the only way to know for sure you have it clean. Then, as MOPAROFFICIAL said, make sure all the rubber hose in the fuel system is new and clamped properly. Fuel hose is cheap. If you remove and install the tank yourself, that's pretty cheap too. All it takes is a little effort and you can have a really nice clean fuel system.
