It slipped my mind and I never drained the old fuel out of the tank before I poured new stuff in.
I've put appx 10 gallons in the tank and I've got the thing running a few times (5-6 with the old carb which I also didn't drain the fuel from)
But I just put a new filter and different carb on after having it running a few times, and I can't seem to get it running, even though gas IS getting into the carb.

So here's my question: could the old gas still be in the tank? And should I then drain it, or would the new gas dilute it enough NOT to be a problem.

Next question: If the old gas does still exist in the tank (and possibly the lines) could it be gumming up my current carb.

The gas running to the carb seems to be a bit discolored (not the clear/yellow that I'm used to) but it does NOT seem thick in any way.

PS: I don't know exactly how much old gas was in there, but my guess (from listening) is probably less than 1.5 gallons

I wanted to ask these questions before I started to inspect and diagnose any ignition/electrical issues.

Well you just mixed 10 gal of good gas with a 1.5 gal mixture of gas/water sludge !! OOPS, dump the take wash it out with mineral spirits and final rinse with gas. You are most likely allowing all kinds of crap into your carb, might want to drain the bowls on the carb to..

-Man I hate when that happens- :D

DAM!!! That's really not what I wanted to hear.

I guess that's my next projecty then.

Any other opinions on it??

It doesn’t take a whole lot of contaminant to mess up a perfectly good tank of gas so flush the whole system and try again. I’ve done something similar with a motorcycle although my percentage of good gas to bad gas was about 4/5 to 1/5’s. I spent about a week screwing around with every other imaginable fix and when that didn’t work I finally broke down and did the full system flush which fixed the problem immediately.