Looking for a bit of help , I have a lbz which is throwing code p0088 High rail Pressure . the pump is a second hand pump off a running motor , we have checked all the wiring ,we have changed ecu s , fuel rail sensor , checked return line . The only thing we haven't changed is the Fuel pressure regulator on the back off the pump at the moment only because I have to remove the intake manifold to get to it, ( we have modified the intake ). Any thoughts or ideas would be appreciated . I am Western Australia so trying to find any info is limited down here . It is commanding 30 mpa but the actual pressure is 82 mpa thanks