This is the pump you need: https://www.merlinmotorsport.co.uk/p/fuel-pump-for-caterham-7-motorsport-upgrade-pump-itp144 The std pump cant maintain flow rate required at std pressure on the regulator. It tops out at around 205bhp @ 3.5Bar. It *may* be ok on part light throttle, but it wont satisfy fuel rate required and the engine will ultimatley pink, detonate and go pop.....