Installation Instructions: EVAP Solenoid Relocation for 2018+ Mustang GT Intake Manifold Swaps

Step 1: Remove the Factory EVAP Solenoid Line

1. Locate the line going from solenoid to underneath the brake booster.
2. Remove from solenoid, and release from line retainer(s) on the strut tower, and possibly the valve cover.
3. Use a pick or pocket screwdriver to release the green plastic clip on the fitting leading to the fuel tank.
   • If the clip won’t release, pull up on the two small tabs on the fitting’s backside while trying to pop the green clip away.

Step 2: Modify the Factory EVAP Solenoid

1. Cut off both bolt hole perches on the solenoid with a cut-off wheel, Dremel, or hacksaw to reduce its bulk.
2. Use a sander or sandpaper to smooth out the cuts for a clean, factory-like finish.
3. Remove the o-ring from the base of the solenoid.

Step 3: Prepare the Gates Shrink Clamp

1. Find the small plastic shrink clamp on the cardboard tube.
2. Using a pocket screwdriver or pick, insert it between the clamp and cardboard to create a depression, then slide the cardboard out of the clamp.
   • Work the tool in partially from one side, then fully across, and push down on the tool on both sides of the clamp.

Step 4: Attach the Supplied Hose to the EVAP Solenoid

1. Take the provided hose with one preinstalled fitting and slide the loose piece of heat shrink and the Gates shrink clamp over the hose.
2. Optionally, spray brake or carb cleaner inside the hose and on the solenoid base (where the o-ring was removed) for easier installation.
3. Quickly slide the hose fully onto the solenoid without pausing until it’s securely seated.

Step 5: Shrink the Clamp

1. Position the shrink clamp flush against the solenoid’s bottom and apply heat with a heat gun.
   • The clamp will shrink slowly. Watch closely until it stops, then apply heat for an additional 2 passes.
   • Avoid overheating—if the clamp appears shiny or the hose begins to sweat, reduce temperature or increase distance.
2. Once the clamp is secure, move the heat shrink into place to cover the clamp.

Step 6: Install the Hose and Secure the EVAP Solenoid

1. Connect the 90-degree fitting of the hose to the intake manifold port facing the passenger side at a 45° angle.
2. Locate the EVAP solenoid under the heater hose tray and use the included zip ties to secure it in place.
   • Use the 2-way zip tie if you need a slight offset to avoid other nearby components.

Step 7: Install the Second Hose

1. On '11-'14s, the slightly smaller fitting goes on the EVAP solenoid (only visible when looking inside the fitting), on '15-'17s the visibly larger fitting goes on the EVAP solenoid.
   
2. Route the hose behind the cylinder head and under the brake booster, ensuring both fittings click securely into place.
3. Once installed, both fittings should fit snugly. 

Step 8: Connect and Route the Electrical Extension

1. Plug the provided electrical extension into the factory EVAP solenoid connector.
2. Route the extension along the wiring harness toward the firewall, keeping it neat and secure.
3. Continue routing behind the intake manifold, up toward the driver’s side, and plug it into the EVAP solenoid.

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Installation Complete!

If you have any questions or critiques, please reach out to us directly at eric@nocturnal-auto.com.