 Correct fuel pressure?
I have a 96 mustang cobra and just bought the Nitrous express stage one ford EFI kit. I currently have a fuel pressure gauge in the car and at idle it about 29/30psi and a WOT its about 40. In the Haynes manual it says any 98 and earlier mustang should be 30 to 45 psi at idle and the NX guide says it should be 30 to 45 for Gts and the 4v's should be 45 to 60 psi (im assuming this is WOT because that's only when the nos is active). I'm going to change the fuel filter and see if that helps, but does any know the correct fuel pressure for a 96 4v mustang at idle and WOT? And do you think it could be the regulator or pump? | 
