Put an engine in an lly I bought and can't get it running at all. I have fuel in my rails but I havea leaking return line on top of the rear 2 Iinjectors on drivers side. Should I have fuel running through the return lines when it isn't even running? Will the return hose cause me to not be able to buikd rail pressure. I can't get but about 300 psi according to my cts.