Well first off ill just say I have had a nightmare with this whole swap but I finally feel like I'm getting somewhere with it. It's a 90 Merc Marquis motor running on a Mustang A9L comp. At idle with the vac hooked up to the regulator the fuel pressure runs about 31psi with it unhooked it runs right at 40psi. I'm running a single inline pump Airtex number E8445 rated at 45-65psi and 35gph. Do I need a bigger pump or should I start looking for problems elsewhere? Any input is greatly appreciated.