gas tank pressure

[mikey440]

 hey gang, 1982 cb750k, today went for a ride and decided to get some gas, when i popped the gas cap there was quite some pressure, isnt the gas cap supposed to be vented or am i wrong??? it was pretty warm here today but ive never had that before,,,any thoughts??? thanks guy,s...mykee440

[Re-run]

The cap should be vented. Another user here, said you should be able to clean the hole out from the bottom of the cap. It was cb750 winger. Should be able to spray carb cleaner in there.