Alrighty the wife went to bed so I went back to the garage! I got it!
I started at the front. With a very small wire 1/64 from ace, I folded over the end made very tiny teardrop on the end. Hooked to my drill, I could only go 29". It would not go any further. I cut the return line right at 30". The blockage was at least 6" long and rock hard. I ended up cutting back it so only 6" stuck past the firewall. I even tried to drill it and had a difficult time. I know the car sat a very long time.
So now that the front was open I put the weed eater line back in. Amazingly it would only go as far in as it did in the back. Within a 1/2". I went back to the back and tried that way, same result, right at 6'.
So with Stanley's idea, I grabbed a new bicycle cable I had laying around cut the end off and Inserted into my drill. With it spinning and right at 6'4" long I was able to get it through! I switched from front of the car, to under the car by the tank a couple of times and had good results.
I thought for sure the weed eater line would now go through, nope! Anyway,I put a rag over the engine bay side and blew air through it and the rag shot right off.
I really want to get the weed eater line through to really clean it out.
You can see the return line right on bottom side of the starter and the bike cable in the drill at the bottom left.