Free flow vs actual use flow ... using Holley's description of flow on their Red Pump as an example, actual fuel delivery drops for each Lb. of line pressure.
Detailed Description
"... Designed For Enhanced Fuel Flow. Maximum Pressure Is 7 psi ... Motor Flows 97 GPH (Free Flow). Flows 71 GPH At 4 psi."
Similarly, the Carter 120 GPH is the Free flow and the 40 GPH is the flow at 5 psi working pressure. The mechanical pump is just less efficient than the electric so it's actual flow drops more quickly as working pressure increases.
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Triple Black 1971 GTO
Last edited by NeighborsComplaint; 01-14-2024 at 12:44 PM.
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