Maker & Reference
Fuel Pump Sizing Calculator
Fuel pump must supply BSFC × HP at full load with margin. Naturally aspirated, forced induction, and ethanol each have different requirements.
Required GPH
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- LPH
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- Min flow @ pressure
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- Recommended pump
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FAQ
Why does BSFC matter? +
Brake-specific fuel consumption = lb of fuel per HP per hour. Tighter engines run lower BSFC. Turbo + race fuel + E85 all need more.
Why 25% margin? +
Pumps lose flow at higher pressures (boost increases fuel pressure). Voltage drops at idle also reduce pump output. Always size with headroom.