1996 Dodge Caravan Smoke

Engine Performance problem
1996 Dodge Caravan 6 cyl Two Wheel Drive Automatic

Hello

I just replaced my engine. There is a white smoke coming out of the tail pipe and it smells like gas. I put a tissue into the smoke and it got wet with what appears to be fuel. I also have a engine code 0204, "Injector Circuit #4" Does this code have anything to do with the smoking fuel problem?

Thanks