So the fuel pump with the FAST was not able to keep up with the fuel demands of the 632, go figure.
Got a new pump, running all the fuel supply line in 10an instead of the 6an and, and mounted and installed the fuel cell.
Not really happy with the single -8an outlet on the cell so i ordered a T-fitting to tie both outlets into the single -10an supply.
Put a 100 micron filter pre pump and 10 micron post pump