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What about a device that can be used to manually top up the tank to the same level each time? Fill it most of the way with the pump, and then insert this device, which is roughly a funnel with a small tube that extends the same distance down the filler neck each time, with a float, or electronic sensor, or even a tiny video camera? -- so that the fuel can be slowly added until it comes up to that level. This is done before and after the contest.
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