HOW TO INSTALL POWER STROKE FUEL TEMP SOTF SWITCH

FUEL TEMP SOTF FORD 11-19

Tools You’ll Need

  • 10mm socket or wrench

  • Trim removal tool or flathead screwdriver

  • Flashlight

  • Zip ties

  • Drill + step bit (only if mounting a new switch hole)

Step-by-Step Installation

1. Disconnect the Batteries

  • Disconnect both negative battery terminals

  • This prevents CELs, shorts, or ECU damage

2. Locate the Fuel Temperature Sensor

On most Powerstrokes, the fuel temp sensor is located:

  • On the high-pressure fuel rail

  • Or integrated into the fuel pressure sensor harness

Sensor Fuel Temperature - 6.7L | Parts | Ford.com https://cimg2.ibsrv.net/gimg/www.ford-trucks.com-vbulletin/640x360/b41d4ff1_9f60_4614_83d1_62bf7741ce26_678_000000ebcffc4495_ad092967dfbc27fcaed9b102cbf31e5bee1ef15f.jpeg

3. Unplug the Factory Fuel Temp Sensor

  • Press the tab and unplug the factory connector

  • Inspect the connector for dirt or damage

4. Install the SOTF Harness (Plug-and-Play)

  • Plug the male end of the SOTF harness into the factory fuel temp sensor

  • Plug the female end into the factory wiring harness

  • Ensure both connectors click and lock

Do not force connectors
If it doesn’t click, it’s not seated correctly

5. Route the Switch Wiring Through the Firewall

  • Locate an existing rubber grommet in the firewall

    • Common spot: behind brake booster or steering column

  • Carefully pass the switch wiring through

  • Seal grommet if needed

https://www.frontiernet.net/~slray/04F250/QuadGauges/FirewallPlug.JPGhttps://m.media-amazon.com/images/I/61tbvKvwkzL._AC_UF894%2C1000_QL80_.jpg

6. Mount the SOTF Switch Inside the Cab

Common mounting locations:

  • Lower dash panel

  • Kick panel

  • Center console

  • Blank switch panel

Options

  • Drill and mount clean

  • Or zip-tie under dash for hidden install

7. Secure and Clean Up Wiring

  • Zip-tie all wiring away from:

    • Exhaust

    • Steering shaft

    • Pedals

  • Avoid sharp edges

8. Reconnect Batteries

  • Reconnect both negative terminals

  • Tighten snug (don’t over-torque)

9. Verify Operation

  • Key ON (engine off)

  • Rotate switch and confirm positions change

  • Start truck and check for:

    • No CEL

    • Normal idle

    • No warning messages

Do NOT switch tunes under heavy throttle
Only switch:

  • At idle

  • Or steady cruise (light throttle)

Important Notes (Read This)

  • Fuel Temp SOTF works by altering fuel temp input to command tune changes

  • This does NOT add power by itself

  • You must have compatible tuning loaded

  • Switching too fast or under load can cause limp mode

Quick Troubleshooting

CEL after install

  • Check fuel temp sensor connection

  • Make sure harness is fully seated

Truck won’t start

  • Harness plugged in backwards

  • Sensor connector not clicked in

Switch doesn’t change tunes

  • Tuning not configured for SOTF

  • Switch wiring damaged or pinched