Calculate fuel pump flow rate requirements for engines.
Performance Goals
Estimated crankshaft HP
Typical: 0.50 (NA), 0.65 (Turbo/E85)
Rec: 20-30% cushion
Results Title
Lph Required189.0 LPHLiters per hour
Gallons Per Hour49.9 GPHGallons per hour
Fuel Type Guide
Gasoline (BSFC)0.45 - 0.55
E85 Ethanol0.75 - 0.85
About this calculator
Overview
Fuel pump sizing ensures adequate fuel delivery for engine power. Based on horsepower, BSFC, and fuel type. Undersized pumps cause lean conditions and power loss. Critical for performance builds.
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Pro Tips
E85 requires ~30% more fuel volume than gasoline, so your BSFC should be increased accordingly.
Always check the pump's flow chart at your specific target fuel pressure (Base + Boost).
Fun Fact
Did you know? Modern high-pressure fuel pumps (GDI) can operate at over 2,000 PSI, requiring specialized mechanical pumps driven by the camshaft.
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Fun Facts
Formula: Flow (lb/hr) = HP × BSFC / Number of Pumps
