[computerworks]

They were plumbed as a secondary pump set up from a pickup lower in the tank.

The mechanical draws fuel from a higher point; the 240's are normally off during normal operation.

The purpose was, when the tank ran low and the mechanical pump starved, the racer could throw a toggle on the dash to turn on the electrics and make it back to the pits.

The plate that has the fittings on the fuel tank would have two fittings, with one drawing fuel lower than the other.