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some ideas still floating around for accurate and cost effectiveness,
small reservoir that refills at a certain level to another certain level, keep track of the refills, needs vent and inlet solenoid.
positive displacement pump (dual piston or gearrotor), keep track of revolutions, possibly replace stock fuel pump (or be driven by pump).
Two piezos at opposite ends of hdpe tube to measure flow through the tube (needs basic DSP at fairly high resolution).
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