Fuel Rail Pressure Calculator

Calculate fuel rail pressure requirements for different boost levels, injector differential pressure, and fuel types.

Input Parameters

Results

--
Rail Pressure at Boost
psi
--
Injector Differential P
psi
--
Flow Increase vs Base
%
--
Return Line Flow
%
Note: Rising-rate regulators maintain constant differential pressure across injectors regardless of boost. Returnless systems lose differential under boost.

Reference

Rising Rate: Rail P = Base P + Boost P Differential P = Rail P - Manifold P = Base P (constant) Returnless: Rail P = Base P (fixed), Diff P = Base - Boost Flow Change = (sqrt(Diff_P / Base_P) - 1) x 100 Injector flow proportional to sqrt(differential P)