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Hello are you trying to use a gas pump to fill up or a gas can?
On the side of the fuel filler there are two spring loaded detents. Can you push on each side with your finger?
It isn't to common but if one of those tabs got stuck it's likely caused by dirt or a small rock. Sometimes just manually moving them will clean out any debris and allow it to operate normally again. If it acts up a lot you will need to replace the fuel filler neck.