Stay away from this asian crap. The standard issue fuel pump is plenty. Even a 4.6 is pretty low demand for the stock fuel pump. You'd have to be flowing over 900cfm with 30lbs/h nozzles before the Rover pump would start to wheeze.
1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88
All my troubles are Rover