OK the tank is off and it's far less goo than I thought. Just a thin layer. It is nowhere near as much as I thought there was going to be. It's not really hardened or rubbery as what I dug out of the shutoff valve.
I found some of that hardened rubbery deposit also inside the pipe to the 1st fuel filter. No more of it anywhere else I could find except I have not pulled the supply pump off to look inside it.
It sounded very gritty when I collected up a sample oft eh goo. I wiped the bottom of the fuel tank with a long flat screwdriver to reach in a get some. You can see a lot of detail in the photo of the cleaned off standpipe from inside. I'd say the layer is 1/16" or less.
I was mistaken when I was pushing the standpipe up into place and when taking it out. Apparently it has a rubber piece that seals around the standpipe.
I put a small piece of the rubber goo in some local pump gas with 10% alcohol. It started to get cloudy after several hours but not dark. Today I'll be testing each of the solvents I bought.
It took all day yesterday just to get the tank empty and off the tractor. The fuel that came out is definitely very old. Smells more like paint than it does diesel fuel. Lacquer brown color.
I took the 2nd filter canister down and the inside walls are very gritty feeling. Probably the same as the tank. A wire brush and Brake-Kleen got some off but I think it's good old fashioned rust underneath all the goo.
Whatever it is, it's tenacious ! I could not scrub a clean spot with the wire brush.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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