1990 Nissan Truck Blowing white smoke that smells of gas

My 90 nissan p/u died one day and wouldnt start. When I came back to it an hour later it still didnt start until I floored the pedal and then blew a big cloud of white smoke and smelt of gas. I changed the engine temp. sensor ang it'll start right up but blews white smoke and stinks bad of gas. I just changed the TPS and that didnt help either. The truck seems to run great other than the bad gas smell.

thanks in advance