Fuel Line Sizing Calculator

Calculate minimum fuel line inside diameter for adequate flow based on fuel demand, line length, and pressure drop limits.

Input Parameters

Results

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Minimum Line ID
in
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Recommended AN Size
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Flow Velocity
ft/s
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Actual Pressure Drop
psi
Note: -6 AN supports ~250hp, -8 AN ~450hp, -10 AN ~700hp on gasoline. E85 requires one size larger. Keep fuel velocity under 5 ft/s to avoid vapor lock.

Reference

Flow (GPM) = LPH / 227.1 Equivalent Length = Line Length + Fittings x 1.5 Min ID = (Flow x Length / (Max_drop x 18.5))^0.25 AN sizes: -6=0.344", -8=0.438", -10=0.563", -12=0.688" Pressure Drop = Flow x Length / (18.5 x ID^4)