There are a bunch of risks, many of which others have already mentioned. The most relavent risk you OP is that if a fire breaks out and your car was running at the time, then *you* are now liable for any damage, injuries, or deaths which occur because of your negligence.
Why would leaving your car running while you fuel it be considered negligent? Because (in most jurisdictions) it is illegal. By definition, ignoring the law is negligent behaviour.
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