BSFC-based pump sizing with pressure correction and safety headroom analysis
Fuel pump ratings are at a nominal test pressure — flow drops significantly at higher operating pressures. This calculator corrects for your actual system pressure using the square-root pressure relationship. Always include a 20–25% safety margin and verify with your tuner.
Results
Required Pump Flow
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LPH at operating pressure
Required Pump Flow
—
GPH at operating pressure
Operating Pressure
—
PSI
Base Fuel Flow
—
LPH before headroom
With Safety Margin
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LPH recommended
Per Pump (if dual)
—
LPH each
BSFC Used
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lb/hp-hr
Pressure Correction Explained
Pump flow ratings are at a nominal test pressure. At your actual operating pressure, flow will be lower.
Common Pump Sizes — Rated Flow at 43.5 PSI
Pump ratings below are at standard 43.5 PSI. The "Flow at Your Pressure" column shows what they actually deliver at your operating pressure.
Pump
Rated LPH (43.5 PSI)
Flow at Your Pressure
Per Pump (if dual)
Status
Build Assessment
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Expert Fuel System Guidance
Not sure if your pump setup is adequate? Our team can review your fuel system spec and recommend the right pump, regulator, and line sizing for your specific build.