UPDATE: I had my friend take the fuel line and rout it to a gas container, then open the sediment bowl valve full open and watch the flow into the catch container. He reported that it was just dribbling flow. He left it to drain for several hours, and the tank never drained out.
I went over to see what was going on. We removed the fuel line from the sediment bowl under the gas tank and blew it out with compressed air. Crap blew out, pretty nasty. Inspected the tube and found about 1/3 blocked with sediment buildup. Sprayed carb cleaner thru the tube a few times and blew out with compressed air.
Checked for flow out of the sediment bowl, not much there. We took the bowl off the bottom of the tank, and it was crudded up badly. The screen inside was full of sediment crap, the inlet port to the top of the bowl was full of sediment, nearly plugged up. Cleaned all bowl ports with carb cleaner and reassembled. Put the sediment bowl back under the gas tank. Put fuel in the gas tank and checked for flow thru the cleaned bowl assembly....good flow now. Assembled fuel line to bowl assembly, and installed carb to manifold, then installed fuel line to carb. Opened the fuel valve at the bottom of the tank and got distracted with conversation with my friend. After a couple of minutes we heard a trickling sound, and looked back at the tractor to see fuel running out of the bottom hole of the carb body. Dang it!! We shut the fuel off at the bowl to stop the leak and waited a few minutes to ponder what was going on.
Decided to see if the tractor would run now that we know we have good fuel flow to the carb so we wired the battery back up and cranked the starter. Nothing!
My friend cranked it again...nothing! Then he remembered he didn't have the ignition switch ON. Flipped it ON, sprayed Starting Fluid in the intake and .... Varoooom!
She started right up so I quickly opened the fuel valve at the bowl under the gas tank.
Tractor continued to run. Running pretty good, but really RICH, lots of smoke out the exhaust. Tried to adjust with the idle air screw, but no real difference made. It will go from smooth idle, to not so smooth idle, but the smoke is considerable out the exhaust.
I also noticed that there is no fuel dripping or running out of the carb while the engine is running.
We let her run for about 5 minutes trying to make idle mixture adjustment, then decided to quit for the day as it is now dark outside. Shut the fuel off at the bowl valve just in case it decides to pour our the carb again, and shut the engine down.
Will adjusting the timing slightly make a difference in how RICH the carb is running?
We've still got to figure out a fuel line issue.
Gotta nail down fuel coming out of the carb.
You mentioned a screen inside the carb body top where the fuel line attaches. That screen was all crumpled up inside the fitting hole, so I removed it. I plan to put a plastic/paper in-line filter in the fuel line after we resolve the above issues.
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