An update for anyone looking to replace the fuel pump in the future. The original pump fitted was a AC6443327 as I needed a pump with more flow rate but wanted to keep it internal to the tank I chose a Walbro GSS340 high pressure pump. Rated at 255ltr/hr @ 3 bar. Old pump, filter sock very dirty New pump slighter larger circumference. I had to make a cut in the plastic holder so it would fit the slightly larger pump. The metal frame with rubber luckily still fitted and held the pump firmly in place. New filter sock fitted. I also purchased a wiring kit for the Walbro pump as the old pump just had spade connections, I tested the pump in a bowl of fuel before installing to check wiring was correct, it was all good. red/red black/black. All the parts were from Demon Tweeks. Pump FSEGSS340 Wiring Kit (plug) FSE22-615 Filter Sock ATLFT-AB-003