A loose connection sparking (though that could happen with or without the engine running) might be one way. If oil dripping on a hot header can start a fire, well... the flash point of gas is certainly lower than oil, you make the call. Sure, the chances are extremely low of a running engine lighting a fire, but if costs you little to nothing to turn the engine off, you really can't blame anyone who does so. The pump warning may have been around from a time when loose spark plug wires and sparking condensor points were the norm, but I'm not 100% certain all of the dangers have disappeared.
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