If the LQ4 has a single feed fuel rail, do the conversion to a Corvette style fuel filter as mentioned in the conversion topic. The filter will supply a constant 58PSI to the fuel rail and the fuel pressure regulator on the fuel rail will give you 50 PSI at idle and 58 at WOT. Cut the lines at the stock fuel filter and splice the Corvette filter in there. The return line is also there. You will have two lines on the back side of the filter and one line from the filter going to the engine. All the parts required to make it work are available from most any auto parts store. Be sure you use hose rated for 60 PSI or more.