How old is the gas in the tank ? I had a similar issue many moons ago , I dumped gas in a tank that I THOUGHT was empty to get my Superbee running before I bought it , turns out the 5 gallons I dumped in was on top of the gas/varnish that was in it already , the bottom of the float was rotten away i discovered later when I pulled the tank ... try running the car from a known clean gas jug running a line from the fuel pump into the jug ...
Second that notion. I bought this to use as a temporary fuel tank when the stock tank is unavailable for whatever reason. Tie wrap it to the grille and away we go.
Temporary Fuel Tank
