On my favorite RC model I could hold it up vertical and adjust the needle valve and release and it would go straight up and go out of sight in about 9 seconds. Just put it in a flat spin to bring it back down in site.And sliced finger tips forever and boy do they sting when the glow fuel hits the cuts
I had heard of the issue coming up in 172s, albeit rarely and a bunch of holes in the Swiss cheese need to line up for it to be an issue.Not in a 150 at typical altitudes. Most flight schools tell the students to leave it full rich all the time to avoid problems caused by over leaning.
Fuel gauges in light aircraft work well enough when the airplane is new. Age and hours wear them out. An airplane tied down outside will rock in the wind a bit, and the fuel in the tanks will move around some and move the fuel sender and cause wear in its rheostat. Electrical connections get oxidized and cause erroneous readings. Floats degrade and sink. The gauge itself gets sticky and the fine wires in its electromagnets can fail. The circuit breaker that feeds it can get oxidation on its contacts and cause supply issues.I know, I know, “But what about the fuel gauge?” Have those ever worked reliably in a light single? You know you dipped the tanks before departure and you know how long you’ve been flying and you know what the POH says fuel burn should be, so the gauges must be out of whack, right? Heck, they probably have been the whole time you’ve been training so far so why start trusting them now? That’s how people get caught out.
Actually, in a high-wing gravity-feed system, fluid seeks its own level, and you can't get air to the carb if there's fuel in one tank and none in the other unless the tank with fuel has a leaky fuel cap, usually the right cap. The leaky cap will allow the low pressure atop the wing to pull fuel from the left to the right until the left is dry, and if the suction is great enough it will pull air through the system so that the carb gets nothing. It also requires that the cap be misaligned enough that the vent holes in it get their static pressure messed up. Normally, though, in such a situation a lot of fuel gets sucked overboard through that leaking (or missing) cap.On the original subject, in the video you can see that one tank is showing empty, the other something under 1/4. In a C-150 with only a "both" setting you don't want to run a tank dry!