Foow up: I switched back to using external tank. I ran it a few times, but wasn't able to loosen the stuck valves. I took carb apart to clean it, but it was fine. No varnish in it. I pulled the valve covers off and cylinders 1,4 and 6 had stuck exhaust valves. Valve train was clean, no sludge.. On c...

Follow up: I went outside late last night tapped on the side of the head with a plastic hammer and was able able to get the vehicle started. Sounded flooded, running rough and it wouldn't idle. I had to push the pedal all the way down to keep it running and it never could rev up too high. Pretty sur...

A little background: For the last 20 years, I have mainly been driving my M37 around the neighborhood to keep batteries charged etc. It's not street legal, so lately I have been working on getting it legal. This past weekend, I reconnected the gas line from gas tank and filled it with gas for the fi...