When the dryer is running it smells like charcol ligher fluid

Sometime recently there has been a petroleum product used in the house. Possibly an oil based paint, stain, varnish, adhesive or some form of cleaning product.

Anyone of these products or many others like them, contain a distillate of liquid. Check around the house.

Until that oil based product dries or cures, the odor and vapors will remain and so will the dryer smell.

At the end of the drying cycle, use the air fluff cycle to purge out the smell. Besure to return the selector on the dryer back to it's prior postition.