Fuel Flow Requirement Calculator

The engine-side requirement is estimated as horsepower × BSFC × margin. That produces mass per hour. Volume is then estimated using the density you enter. Separating mass from volume is important because two fuels can require different volume even when the engine needs a comparable energy or mass-flow strategy.

Pump selection must use the pump’s flow curve at the pressure and voltage the car will actually see. A boosted regulator raises rail pressure with manifold pressure, so a 43.5-psi base system at 20 psi boost asks the pump to deliver at roughly 63.5 psi rail pressure before line losses.

A 500-hp target at 0.60 BSFC and 15% margin requires about 345 lb/hr of fuel mass. The corresponding LPH depends on the entered density. Compare that result to the pump curve at operating pressure, not to a free-flow marketing number.

This is not a pump electrical-sizing tool and does not model regulator bypass flow, line loss, heating, ethanol composition or pump aging. Build headroom and validate fuel pressure under real load.