To GTB or not to
AO Silver Member
Join Date: Nov 2007
You can't fit your old regulator valve to new pump, because they are not compatible, this new pump works in a completely different way.
Old pump works at full throttle and then DRV valve diverts excess fuel, from the high pressure side of the pump, back to the fuel tank.
New pumps adjusts by MPROP valve, at low pressure side, how much fuel enters the pump, and by that it regulates pressure and fuel flow.
It is a completely different concept.