Bitter learning curve. Absolutely DONE with carburetors!!!

Not sure where four plugs came in to the picture, all my plugs have been consistent. I took a stethoscope and tracked it down today, it's most pronounced when I put the probe on the fuel pump, so maybe bad fuel pump, or number 2 cylinder??? Anybody ever heard a fuel pump knock? I'll just change the dam thing this weekend to rule it out. I'm also going to cut the filter open to see what we have in there. It gets an oil change this weekend anyway, but I'll open the filter to see if I'd be wasting money on the oil change. I also have a set of plugs waiting to go in so Ill get pics of those as well. I sure hope this doesn't turn out to be bearings! I'm still getting FiTech, lol!