So to adjust fuel pressure, i have to take the hose off first and then adjust my fpr? On the import tuner website, under the "tech" page, they added cams to a 2000 civic si. It says there that they increased fuel pressure from stock 42 to 48 psi. Now would that be with or without the vacuum hose on? Because right now, I have it at 46 with the vacuum hose on and i have a check engine light!!!