My factory quick connect o-ring got ruined from age, so I decided to upgrade the entire fuel system, everything I had was 15 years old. I bought an aeromotive A1000 pump and filter, ran 8-AN braided line from the pump to the rail, and ran 6-AN return to the tank. I ran a new line from the pump/filter to the top of the tank and put a new pickup hose in the tank. Anyway the old setup had about 43-45 psi at idle and the new setup now idles at 56. The regulator on the rail was never touched and it is the accel adjustable, which is just the factory one modified with a spring and spacer and new top housing. Just wondering what would cause the change in pressure, I thought the regulator would make it the same as before.

 

well not necessarily. Fuel pressure regulators are limited by many factors but if that pump flows a lot more then the factory you might experience the increase in pressure.

How does it run?

 

Aeromotive rates that pump at 700 #/HR at 45psi, with 13.5V. 700/6 = 117 Gallons/HR x 3.78 = 441 LPH. You are more than double the stock pump flow. You may have exceeded the capacity of the stock/Accel AFPR. Did you try adjusting the AFPR?

 

Not yet, I'll try it tonight. The pump I had in there wasn't stock, but I don't know what it was. It was mounted external 15 years ago. I know it flowed more than the stock. I was gonna upgrade the regulator, but I keep reading that the Aeromotive regulator is not so reliable.

 

I run dual 205 LPH pumps, through a Weldon AFPR. Just weld another -6AN fitting on your drivers side rail, in place of the AFPR, and run the line to a stand alone AFPR mounted under the cowl, then to the tank return. Or with injectors that large, and that much fuel flow, do what I did - feed a -6AN into the back end of each rail, and take the -6AN return off a fitting welded to the diagonal cross-over pipe at the front of the rails. You end up with much less pressure drop in the rails, meaning the pressure at each injector is more uniform.