The only things I can find which talk about modifying the fuel system are as follows.. From the club permit guidelines for vehicles The relevant section from vsi8 The section on fuel system in vsb14 was written in 2011 and hasn't been revised yet that I can find. It makes no mention of efi at all. There is a mention of "optional oem" equipment not needing certification.... Which tacitly says that anything not made in the era of a vehicle, installed by that manufacturer at any point in the correct period, or creates a power increase deemed "significant" must be signed off to pass and has always been the case.