Maintained the Carl Goldberg Ultimate 10-300 yesterday. After one flight a week or so ago, the plane would not take on fuel for another flight. It felt like the tank was fully pressurized and fuel would not go into it. A few days ago, I took the tank out...to do so requires removal of the spinner, prop, muffler, cowl, and both damn wings! Finally got it out and replaced the fuel lines inside the tank, the clunk, and the lines to the engine and muffler...I guess that means all lines. I did not find anything really wrong with what I yanked out other than blackness in the muffler line, typical. At least I determined the tank itself is still sound. With the cowl off, I found the Robart fueler was falling off due to a broken back plate and missing bolt (one of two). Figured out a way to secure that without a new backplate. And I repaired the biggest cracks in the old ABS cowl with FG cloth and copious amounts of thin and medium CA. Someday this old plane deserves a strong FG cowl.
Anyway, I tested fueling of the tank with it out of the plane, and via the Robart fueler, and didn't really find anything wrong except if the lines are hooked up wrong to the the two nipples on the Robart fueler. The back nipple must go to the tank for it to work. The thing had to be hooked up right for it to work all these years until last week. Basically I think I did not find the real problem but when done, the fueling worked, so I just have to try flying the plane this way. It should work fine, but the mysterious issue remains mysterious. Oh well, I got some satisfaction by doing the maintenance.
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