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Interesting idea. Couple of thoughts. The fuel bowl has a high level and low level and will not always contain the same amount of fuel, the difference may be a trivial amount. Also will the pressure in the fuel line allow the bowl to partial refill even after the pump is shut off. These concerns are only if you are tiring to produce a amount of fuel used. If you go with your original idea of time and you throw out the top 20% and the bottom 20% of the results for each test you should have a good idea which ones work.
As for wasting fuel if you kill the pump while still moving and roll to a stop I see no additional waste of fuel.
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