>I tried to remove the right gas tank cap and it felt unusually hard.
>However, as I removed the cap, I hear a rush of air getting in the
>tank. There was no visible obstructions on the gas vent.
>Something is preventing the inside tank presure to equalize with the
>outside pressure.

Just because there is no "visible obstruction" doesn't mean that there isn't something plugging the vent line. You must look into this prior to further flight. Drawing fuel from that tank will collapse the wing skin and crush the ribs. As the fuel is removed the air pressure outside will squash it like an aluminum beer can in a TV commercial. It initially shows up as the skin oil-canned in between the ribs, but upon descent as the outside air pressure rises, it will do structural damage as you attempt to land.

--Bob Steward A&P IA
Birmingham, AL


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