Fuel Pump Sizing Calculator

Calculate the correct fuel pump size based on power output, fuel type, and system pressure requirements.

Target Horsepower

BSFC (lb/hp-hr)

0.45-0.50 gasoline, 0.60-0.70 E85

Base Fuel Pressure (psi)

Boost Pressure (psi)

Safety Margin (%)

Fuel Type

Fuel Flow Rate

250.0 lb/hr

Base Flow Required

40.5 GPH

With Safety Margin

48.6 GPH

Total Pump Pressure

58.5 psi

Pressure-Corrected Flow

56.4 GPH

213 LPH

Recommended Pump Size

255 LPH

Est. Current Draw

8 Amps

Recommended Wire Gauge

14 AWG

Pump Recommendation

OEM upgrade or 255 LPH in-tank pump

In-Tank Pumps: Quieter, fuel-cooled, limited by tank access
Inline Pumps: Higher flow capacity, easier to upgrade, may need lift pump
E85: Requires 30-40% more flow than gasoline due to lower energy density
Boost Reference: Always use rising-rate FPR or boost-referenced regulator with forced induction