I wish I knew the answer for you. FWIW...I did replace both of my Fuel Pumps, Filter, and Accumulator at the same time and pressure was a lot stronger after letting it sit plus, when I opened my gas tank, it held more pressure than before after running and sitting where it would lose it after about 10min of sitting with no vacuum held in the tank. Now I struggle a bit to get the cap off. Has to be a simple answer there somewhere for ya...