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The fuel pump has three functions: to deliver enough fuel to supply
the requirements of an engine under all operating conditions, to
maintain enough pressure in the line between the carburetor and the
pump to keep the fuel from boiling, and to prevent vapor lock.
Excessive pressure can hold the carburetor float needle off its seat,
causing high gasoline level in the float chamber. This will result in
high gasoline consumption. The pump generally delivers a minimum of
ten gallons of gasoline per hour at top engine speeds, under an
operating pressure of from about 2 1/2 to 7 pounds. Highest pressure
occurs at idling speed and the lowest at top speed. Although fuel
pumps all work to produce the same effect, there are various types
that may operate somewhat differently.
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