If you can get it clean it would help. Old gas doesn't burn clean and all the crud in the tank settles to the bottom where the pumps pick-up is.
I don't know if you checked your fuel pressure yet, check that as well. Most pumps can produce more pressure than the system uses, Yours should be running at 50-60 psi. But if the regulator is bad the pressure could be higher, that can cause more flow through the injectors and it will act like it gets flooded out with the extra fuel. You get the same sooty plugs and poor running.
Friday, February 24th, 2017 AT 7:06 AM