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FTBwikiより
A Pump uses 10 MJ per pumped block. Maximum filling rate is 20 buckets / sec, or 10 MJ/tick or 100RF/tick, from 2 Combustion Engines running on fuel (fuel equals 5 MJ/tick when used in 1 Combustion Engine, so 2 Combustion Engines will Provide 10 MJ/tick).