Pat,

I went through the same thing with mine. If the truck has sat for any length of time the tank is most likely rusted from condensation. The best fix is to replace the tank or you will fight the issue from now on. I purchased and installed a new tank, new fuel lines and reworked the original carb.

My tank cost 175 dollars....it was well worth it.

Red

63' C20 Stake Bed
http://s1164.photobucket.com/albums/q578/raptorsrule/