In this video Doc shows you how to fix those new cans without vents that won’t let gas come out. Yes, this started in California with regulations and then spread across the US. Doc recommends you buy the add on vents and install them, but a temporary fix is shown here. Make sure you seal the hole with tape.
Glug… Glug… Glug… go the new gas cans with no vents. Yes, they are horrible and this is the fix.