I have a 2002 5.9 cummins. It has an edge juice with attitude chip. I was only getting 10-12 psi of fuel pressure so I changed my fuel pump with the fass DDRP pump and I'm only sitting at about 12-14 psi at idle. When I punch it. Drops to 0. Anyone know something to fix this??? I know I should be getting way more than that for pressure.