My truck sat for a long time unused before I bought it. After I got it roadworthy it was running very nicely until I tried to go up a hill or run wide open, then it died. I took the fuel pump apart, it was full of rust gunk as was the filter. I opened up the carb and it was full of gunk in the float bowl. New fuel pump and filter, rebuilt the carb and scrubbed it clean. Fired up the truck and went on a ride and it died. Hauled it home, drained the gas tank, tore it out and looked inside - full of gunk balls and rust scale. Turned it upside down and got probably 2 cups of junk out of it. So bought a brand new tank and sending unit.