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Under the right side of the filler cap area is another hole like that, it's the hole that feeds the tube in the cutaway tank picture and it drains the filler cap recess. You can use low-pressure compressed air to blow in one end of that tube and feel pressure on the other end, with no hissing inside the tank. The hole in your picture (on the uphill side of the recess when the bike is on its sidestand) feeds vapor into the charcoal canister/pump assembly. You can test that the same way. Another way to test both tubes is to fill the tank all the way up to the filler neck and see if fuel drips out of either of the two tube ends at the back of the tank that are connected to those two holes. The third tube at the back of the tank is the liquid return from the canister/pump assembly, it dumps out at the very top of the inside of the tank.
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