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The problem with this method (BG below) is it totally ignores the weight of the vehicle. Here's a test I plan to preform someday soon: Take fuel bowls off carb and put them in cans and turn on the fuel pump and see just how much the pressure drops at maximum float drop.

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...barygrant...has got a ton of good info on this topic. Basically, their "fuel Can Test" pretty much makes the line size / pump size topic a moot point. It's based on how many seconds it takes to fill a 1 gallon gas can.

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What does the weight of the vehicle have to do with it?

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The heavier the car is the more HP it needs to make the car go down the track at a given ET wich means more fuel. The can test leaves to many variables, maybe a very rough baseline at best.