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10 Remember, as displacement increases, so does fuel demand. Because our 390 is no longer a 390, we must consider fuel consumption and the need for greater gph (gallons per hour) at wide open throttle from our Holley 110-gph pump. If your Mustang has a 5/16-inch fuel line, it is not large enough for an FE. This 442ci FE needs at least a 3/8-inch line from the tank to the fuel pump and the fuel pump to the carburetor.