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The dual electric fuel pumps were only in the trunk of Comp and S/C cars.

They originally used Stewart-Warner 240 pumps, which were quite popular in race applications in the 60's.

The electrics were strictly for a reserve. The 427 Comp Cobra had a mechanical pump up front. There were two fuel lines from the tank, one placed higher than the other. The upper one drove the mechanical and the lower one went to the electrics. There was a toggle switch on the dashboard to turn them on.

There was no fuel level gauge in the Comp Cobra...when they sputter on a low tank, they flipped on the electrics to pull the last drops until they could pit.

Today the 240's are rare and costly. Modern day equiv made by Facit (or the old Bendix) are used by Shelby and others in their replicas.