Hello all, I have problem with the fuel pressure staying consistent in my car. It,s a '70 Cuda 440 it has an electric Aeromotive S series pump from Summit it looks like the one to use up to 750hp. It was in the car when i got it so not sure how old it is either but looks fairly new. I have 1/2" line from the pickup to the regulator also aeromotive. I have also put a aeromotive 100 micron filter between pump and tank. Now the problem is when i start it up it has 8.5 psi at the reg take it for a drive and pull up let it idle and check the it and it drops down to anywhere between 2 and 4 psi (gauge is under the bonnet). The previous owner had a 10 micron filter on and i thought that may have been the culprit while it did help it still isn't right. What should i try next.