If that is after 1,000 miles, that has a lot of carbon and oil residue on it. Next time you pull the plug, wipe the electrode with your fingers and see if you get any oil off of it.
I suspect you have an oil control ring issue on that piston. That would explain everything because a fuel pump as you stated would not affect just one cylinder.
Does it smoke at all when it is running? Since it is just one cylinder it is only going to be a small amount.
However, the tip being covered with oil is what is causing it to fail, so the question is where is the oil coming from? Since it is only one cylinder, the likely cause is the oil control ring.
Friday, June 7th, 2019 AT 7:11 PM