That is a redundant connector on a replacement fuel pump. It would have been the connection to a fuel level float which has been removed.
There is normally a cover encasing the top of the pump and electrical connector, the fuel pipes come out of the side of said cover, you seem to be missing this.

Last edited by Rog G; 13/04/22 06:49 PM.

2021 M3W
2013 M3W - Sold
1971 4/4 2 Seater
1934 Sports