You should know the Ford fuel pump wires color codes before performing any DIY repairs on the wiring. This is because the fuel pump is an important part of your vehicle’s fuel injection system. It will be challenging to connect the wires without technical knowledge of the color scheme.
My guide contains sections stating the fuel pump wires color codes for Ford F150, F250, and F350.
Also, expect to see answers to frequently asked questions related to the topic as you approach the end of this article.
- 1 Ford F150 Fuel Pump Wires Color Codes (Single Fuel Tank)
- 2 Ford F250 Fuel Pump Wires Color Codes (Single Fuel Tank)
- 3 Ford F350 Fuel Pump Wires Color Codes (Single Fuel Tank)
- 4 Ford Fuel Pump Wires Color Codes for Vehicles with Dual Fuel Tank
- 5 Ford Fuel Pump Wires Color Codes – FAQs
- 6 Final Thoughts
Ford F150 Fuel Pump Wires Color Codes (Single Fuel Tank)
All F150 trim levels use the same type of fuel pumps. See the F150 Ford wiring color codes below.
It gives your truck’s pump motor inertia switch a +12-volt supply.
It provides the return passage of the motor’s electrical current or supplies ground connection. The circuit has a 20 amp fuse and fuel pump relay to direct the operation of the pump from the powertrain control module (PCM) and protect it.
Yellow / White and Black / Orange
The fuel pump features a sending module that measures the tank’s fuel level. The unit also transmits signals for the fuel level to be displayed on the dash. Your F150 fuel pump’s wiring harness has two cables dedicated to the sending unit. A yellow/white cable transmits signals to the dashboard’s instrument cluster to display fuel level, while a black / orange cable is the sending module’s ground.
Note: Aftermarket fuel pump wiring color codes are different.
Ford F250 Fuel Pump Wires Color Codes (Single Fuel Tank)
The Ford F250 offers dual and single fuel tank options. The single fuel tank option bears similarities to that of the Medium-Duty option of the F150, including fuel pump wires color codes.
Ford F350 Fuel Pump Wires Color Codes (Single Fuel Tank)
The F350 single fuel tank has four wires (two for the fuel level sender module), as explained below.
This wire carries 12 volts of power. It gets heated when cranking your engine to start.
The orange cable is the ground for the wiring.
It enables the dashboard’s instrument cluster to show your truck’s fuel levels.
This links the ground in completing the sender unit’s circuit. There is a relay unit pump relay that triggers it to turn on and off in line with the signal sent by the PCM when the engine is started.
Read more: Ford F150 Radio Wiring Harness Diagram
Ford Fuel Pump Wires Color Codes for Vehicles with Dual Fuel Tank
Ford trucks also have dual fuel tanks, apart from single fuel tanks. The vehicle having dual fuel tanks means that there are two fuel pumps. You can choose between any of the two fuel pumps using the dashboard’s selector switch.
Fuel Pump Relay
The unit has four colored wires, as described below.
This cable gets the power to the relay coil from the PCM.
It is linked to a 20 amp fuse.
The deep green/yellow wire is a typically open relay contact powered when the engine is working. It gets 12 volts.
It is a PCM relay control cable that transmits signals to a relay coil for de-energizing or energizing.
Selector Switch for the Fuel Tanks
This switch is located inside the vehicle’s cabin on the driver’s side. It lets you choose between the rear or front tank with six cables to control its workings, as described below.
This wire switches the pump of the front tank on.
It powers the rear tank pump.
This is for the rear tank’s sender module.
It is for the front tank’s sender unit.
It connects the dashboard’s instrument cluster to the front and rear sender units based on the chosen tank.
The red/yellow cable obtains +12 volts from the fuel pump relay. It is attached to the inertia switch.
Fuel Pump of the Front Tank
There are four wires for this fuel pump and the sender unit, as explained below.
It sends power to the fuel pump.
This aids the pump ground in finishing its circuit.
The deep blue/yellow cable links the dashboard’s instrument cluster with the fuel level sender module.
This is the ground wire, facilitating a return passage for the sender unit’s current.
Fuel Pump of the Rear Tank
It is for supplying +12 volts of power via the same passage as the front fuel pump.
This is the ground to the brown/white cable.
It carries return signals from the fuel level sender module to the instrument cluster.
This is the ground to the yellow/light blue cable.
Ford Fuel Pump Wires Color Codes – FAQs
How Do You Hotwire a Ford Fuel Pump?
Ford fuel pump hotwiring can be done in the following ways:
- Using a self-test connector
The point for the fuel pump test in the self-test connector is circuit 926 (an orange-striped light blue wire). Start the process by grounding that point. Switch the ignition on after to make the fuel pump relay start working. This will make the fuel pump the vehicle’s tank switch selected to turn on.
- Jumping Pin 2 to Pin 6
Use a self-test plug to jump pin 2 to pin 6. The issue may be ground-related, provided that you did the jump and the pumps weren’t activated even with power being at the switch. The fuel pumps and senders are attached to ground G100, which can be found on the radiator support (driver’s side).
What Sends Power to the Fuel Pump?
A vehicle’s fuel pump is powered by its battery via a sequence of parts and their links. The process starts from the pump’s fuse and continues through the ignition switch, ECM (engine control module) relay, ECM, and fuel pump relay.
What Happens When a Fuel Pump Is Wired Wrongly?
A fuel pump won’t be activated or won’t supply adequate fuel to the engine if it isn’t properly installed. The engine may run rough or fail to start up—or it will lose fuel efficiency and power.
What Fuse Goes to the Fuel Pump?
The fuse that goes to the fuel pump is typically a 15 (blue), 25 (clear), or 20 (yellow).
How Do You Test a Fuel Pump Wire?
Follow the steps below to test the fuel pump wire.
Step 1: Detach the connector pins on top of the pump.
Step 2: Use a multimeter to assess the voltage of the ground and power terminals. The problem may be a damaged wire if the reading indicates 0 volts instead of 12 volts at the fuel pump terminal.
Do the following to be sure that the fuel pump isn’t receiving power:
Step 1: Link the multimeter’s negative lead to a well-functioning ground in the vehicle frame.
Step 2: Attach the positive lead to the fuel pump’s power terminal. The fuel pump isn’t receiving power if you get a reading of 0 volts.
A corroded terminal will cause the voltage to drop across the terminals. Your multimeter will indicate 10 volts or 9 volts in place of 12 volts. You will know it is a corroded terminal when the voltage drop is more than 1 volt.
Figuring out the fuel pump wires color codes of your Ford F150, F250, and F350 should be easy with this guide. Let an expert handle the repair work if you still find the unit’s wiring confusing. You may end up creating another problem if you get the connection wrong.