Could it be because the FEO113 pump is just the basic motor and not the complete unit that sits inside the tank as shown in Morgan parts manual.

In the thread I linked to above it explains how just the motor was replaced within the assembly.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone