this is for toby & mike and anyone that needs to know.first off you should check your fuel pressure to see if you have another issue,like a bad pump or a inlet restriction. fuel pressure spec. is 45 psi min. inlet restriction is 6'' hg max. shimming the regulator will yeild about a 4-8psi increase in pressure. i dont advise shimming the pressure above 60psi with a stock pump and injectors. shimming the regulator will insure your injectors dont suffer low pressure on a hard accell or heavy loaded hill climb. all the trucks i have tested have an average of 4psi drop in pressure when you load the engine. fuel pressure at or below 45psi should have a new pump installed. all that is needed to shim the regulter is a bb from a bb gun this works best(tryed all kinds of stuff) the regulater is on the side of the engine mounted fuel filter housing,unhook the return line then take out the 4 tourq screws. at the bottom of the regulater housing is a spring that fits into a brass cup. the bb goes into the brass cup then the spring. with the bb in the cup it acts as a spacer and stiffins the spring. the housing has a 0-ring shaped gasket that can be reused. the return line has a 0-ring on the housing side that will reseal too. at the top of the filter housing is a small white plastic piece this is the air bleed dont loose it,most of them stay in place.you will have to hold the regulater cover in place to get the screws started because the spring will hang out more,put everything back together and prim the fuel system like you changed the filters. make sure thier are no leaks and your done.this will keep your pressure from dropping low and keep the injector barrel & plunger from galling.:Thumbup: imoa doing this and a fuel crossover will help make the engine run smoother give better low end responce and help the injectors live longer. this is not a substitute for a full fuel system just littel things you can do to help. if you wont big hp/tq you need a full regulated return fuel system. hopfuly toby will post the pics i have to get a better idea on how its done.