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Sounds like the spring has come off. There should be a small spring unit near the hinge, to push the door open. It is only a push fit, so may have been knocked off when you filled up.
Not sure how flexible the door area is, but you may be able to put a self-adhesive rubber foot onto the hinge, which will push the door out when you pull the release. Alternatively, a blob of silicon sealant in the right place will do the same job ! Anything that provides a compression when the door is pushed shut will make it pop back out - just don't put anything too big there, or it will distort it !
Regards
Colin
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