BMW Repair Questions? Ask a Mechanic for Answers ASAP
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The problem is that the flap was probably bent a lot when the hose was pulled out. Due to the construction, it is actually not possible for the flap to stand up. It must have been bent with strong force when pulling out the hose.
All you can try is to knock the flap back inwards with a tool (if still reachable). If this does not help, the tank and the filler tube must be replaced.
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