1994 Chevrolet Blazer

Engine Performance problem
1994 Chevy Blazer 6 cyl Two Wheel Drive Automatic 165000 miles

I have a 94 Chevy Blazer with the 4.3 vortec engine. My truck started to run a little rough so I added some fuel injector cleaner in with the gas, this seemed to have resolved the issue for almost 2 weeks. I drove my truck yesterday and it seemed to drag before it came out of first gear to start off, as the day progressed it seemed to get alot worse, I would have my foot on the gas with the pedal to the floor and would not gain much speed if any. I added some more injector cleaner and drove a little distance before I noticed a cloud of white smoke coming from the tail pipe and it putted real bad. I was able to pull to the side of the road and my truck completely shut down. I can't even get it to turn over now. I am unsure and don't want to repair things that don't need it due to lack of money at the present time. I asked a mechanic to take a look at it and he said something about smelling " raw" gas. My question is could this be the fuel pump causing the issues? I am in the process of ordering a spider fuel injector for it. Please help.
October 1, 2010.

Open the upper plenum and inspect the fuel nut kit and the fuel pressure regulator if its leaking you'll see the washed-out area between the two-

Oct 1, 2010.