RE: Which fuel pump to use?
G'day Mate, mine did the same thing, so I squeezed the shaft a bit in a pair of plyers, to roughen it a bit & make it a firmer fit in the drive then put some locktight on the shaft & pushed it onto the drive, it has been pumping for 8 months with no hint of a failure yet. PS, I had been using a Sonictronics Fuel pump for over 20 years until it finally wore out.
Good Flyin Mate.
Allan.