Ford Mustang Fox Body Three-Valve Swap - Three-Valve Transplant

To mount the new rails, simply remove the stock rails...

...and bolt on the Aeromotive rails. The swap is complete.

We started with the feed line. Aeromotive supplies -8 AN stainless braided fuel line for the feed side of the kit. We ran our feed and return lines on the outside of the framerails on the passenger side.

Before running the feed line into the engine bay, a Y-block splits the lines. We mounted it in the inner fender.

The feed lines then run to the backside of each fuel rail. The lines run from the front of the rails to the fuel-pressure regulator, and then back to the tank via a -6 AN stainless braided fuel line. To keep the installation clean, the lines from the front of the rails run under the intake manifold to the regulator, which is mounted on the firewall.

The finished product is simple and clean, and we retained all of the room in front of the engine by running the fuel lines on the backside of the motor.

Cutting the stainless braided line straight is very important. You can use a sharp pair of sheers, but this can pinch the hose, making it difficult to slide the fitting over the fresh cut hose. We used an air-power cutoff wheel.

After unscrewing the hose side of the fitting, slide it onto the fresh cut hose. Be sure it is pushed all the way forward, and there is no gap between the hose and the inside edge of the fitting.

Next, wrap the hose with a piece of tape at the base of the fitting. This will allow you to see if the hose is being pushed out of the fitting as it's screwed together.

Using an AN wrench, tighten the two halves of the fitting together. A light amount of lubricant on the side of the fitting that slips into the hose will allow it to go on easier and not spin the hose as you tighten it.

If the tape has not moved and the fitting is tight, your job is complete.