smoke and combustion problems

Good morning companions, my poble is to change the rings to the Nissan Sunny of 93, when I go in fourth the car begins to get white smoke, similar when the water is burned, and step to fifth calms the problem.
The combustion problem is that the gasoline pump is not working, but I do not know if it is the pump because the gas filter is changed. I don't know if they know a way to try the bomb and get out of my problem

Is the gasoline pump or mechanics ???

The pump is mechanical, the car is full, and I just changed rings