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Hot weather makes venting the tank difficult, but the system should still let most of the fumes out. You may notice some air pressure when taking the cap off, but no liquid gas.
Either the Gas Cap is shot or the tank vent is clogged. First thing i would recommend would be to try swapping the gas cap for one from another car (without the same problem).
The Gas Cap should be a vented style cap, but if it quits it can build up pressure inside the tank. If swapping the cap doesn't stop the pressure, than the vent is clogged, it's on top of the tank
I am not sure I understan tghe question. You should not have a lot of pressure in the tank. There are hoses that capture any vapors that are in the tank and eleviate pressure build up. Most often I have found the engine light on because of gas tank vent, such as loose or bad gas cap or the vent valve stuck open. The computer does a cycle ever so often and maintains the vent pressure build up in the gas tank and vapor canister, and if the purge valve sticks open the computer gives a check engine light and code as the pressure is not in the vapor storage tank when called for. If your worried about no pressure at all then I would change the gas cap and see if this helps
It sounds like the vent in the gas cap is not venting (pluged up).Fuel is like coca cola, when it gets a little shake up it expands.See if you can check the vent in the cap.
Sounds like you are in a hot weather if so it may be the vent in top of the fuel cap. In the hot the pluged hole lets the gas tank build up pressure forcing fuel by the needle valve causing fluding in the carb.
All gas tanks have a vent to let air in to replace the gas as you use it, ussually in the cap. Most have a one-way valve so air can get in but gas can't get out, you found out why when the bike went horizontal. But if the gas gets hot, it builds a bit of pressure and your vent is leaking slightly. That's the whistle you hear and why the fuel spilled. A new cap should fix it.
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