There isn't one... there is a mechanical feed pump on the engine, and then the injector pump (after the secondary filter).

Looks like a lot of manual clicking for me.

OK that saves the impeller. Wears out the fingers, but they grow back.

Looks like DaveEvans had the right answer.

Explains why I couldn't find that electric fuel pump. Probably an option for when the tank is far away from the engine. In this case the fuel tank is within about 24 inches of the engine, just on the other side of a bulkhead, down in the lazerette.