Other than for very high performance cars needing a boost in fuel pressure the main reason to do it is, as was said by a couple of people above, to use the electric pump to fill the float bowls before starting a seldom driven cruise/show car. Otherwise you have to fill them with the mechanical pump by grinding the starter which is hard on the starter and drains the battery. To do this the electric pump can be put on a toggle switch under the dash, and turned off once the float bowls are full which is indicated by a change in tone of the electric pump.
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