Replacing The Fuel Pump Driver Module In Your F150

The fuel pump driver module (FPDM) is an essential component of a vehicle's fuel system, and issues with it can lead to significant problems. While some sources suggest that certain models of the Ford F-150 do not have a separate FPDM, others indicate that it is located above and ahead of the spare tire, attached to a steel cross member. Replacing the FPDM can be a complex task, and it is advisable to consult a qualified mechanic or a specialised forum for specific instructions and guidance.

Check for corrosion on the electronic fuel controller

To check for corrosion on the electronic fuel controller of your F150, begin by locating the Fuel Pump Driver Module (FPDM). This module is situated near the spare tire, on the frame by the spare tire crank.

Once you have located the FPDM, carefully inspect it for any signs of corrosion or damage. Look for corrosion on the back of the module, as well as on the PCB (printed circuit board). Corrosion can cause the module to crack and fail, so it is important to check for it regularly. If you notice any corrosion, it is recommended to replace the module as soon as possible.

In addition to inspecting the FPDM itself, you should also check the mounting surface and the surrounding area for any signs of corrosion or moisture. This includes the frame crossmember that the module is mounted on. Corrosion can occur due to dissimilar metal corrosion between the module and the mounting surface. To prevent this, you can use standoffs or washers to space the module off the frame, allowing for better airflow and drainage.

Furthermore, it is important to consider the environment in which the vehicle is operated and stored. Electronic corrosion is often caused by exposure to moisture, high humidity, corrosive gases, and airborne contaminants. If the vehicle is stored or operated in a damp or corrosive environment, it may be more susceptible to electronic corrosion. Proper storage conditions and regular maintenance can help to mitigate the effects of these environmental factors.

Check the fuel pump relay

To check the fuel pump relay on your F150, you will need to begin by locating the relay. For a 2004 F150, the fuel pump relay is hardwired into the fuse box. The fuse box is located on the front left fender.

Once you have located the relay, you can perform a series of tests to check its functionality. Firstly, with the engine cranking, check if terminal 30 is hot. If it is, you can use a jumper wire to connect terminal 30 to terminal 87. If the fuel pump runs, this usually indicates an issue on the control side of the relay, specifically with voltage and ground.

You can then check the voltage and ground circuits for the relay. The two top wires in the diagram are voltage wires and are both fuse-protected. The voltage comes from the PCM power relay.

If you are experiencing issues with your fuel pump not responding, you can check if there is power coming from the fuel pump fuse to the fuel pump relay. If there is no power, check fuse #18 (15 AMP) in the underhood fuse panel. This fuse provides power to pin #86 at the fuel pump relay. If there is no power on either side of the fuse, it may be blown.

If you are still unable to identify the issue, you can refer to the fuel pump circuit wiring diagram to further troubleshoot the problem.

Check for power to the fuel pump

Checking for power to the fuel pump is a crucial step in diagnosing a faulty fuel pump. Here is a detailed guide on how to do this for your F150:

Step 1: Check the Fuel Pump Fuse

Firstly, locate the fuse box in your F150, which is usually under the dashboard on the driver's side. Refer to your owner's manual if you're unsure. Find the fuse linked to the fuel pump and carefully remove it to inspect for any signs of failure. A blown fuse will be broken or burned. If the fuse looks intact, check other fuses related to the fuel system and replace any that are blown.

Step 2: Test for Voltage at the Pump

Next, you'll want to check if the correct voltage is reaching the fuel pump. Consult your vehicle's service manual to locate the correct testing point and procedure for your specific model of F150. You can then use a voltmeter to test the voltage. If you find more than a one-volt difference, you may have an issue with corroded wires or a problem in the circuit.

Step 3: Test for Power and Ground at the Connector

Locate the fuel pump and find the connector that sends power to it. Slightly wiggle and then disconnect the connector to ensure it's not loose. The connector typically has two thick wires and two thin wires. The thick wires are for power and ground, while the thin wires are float or level sensors.

Connect one jumper wire to the power wire and another to the ground wire. Then, connect the other ends of the jumper wires to a test light to complete the circuit. With the ignition key turned on, if the test light illuminates, you have sufficient power and ground going to the fuel pump.

Step 4: Check for Lost Power or Ground

To check for lost power, connect the lead end of the test light to a good ground, such as a bolt on the car door, and touch the tip to the power wire. With the ignition key turned on and off, the test light should illuminate if you have good power.

To check for lost ground, connect the lead end of the test light to the positive terminal of the battery and touch the tip to the ground wire. If the test light illuminates with the ignition key in the on position, you have a good ground. If not, there may be an issue in the circuit.

By following these steps, you can effectively check for power to the fuel pump on your F150 and narrow down the cause of any issues you may be experiencing.

Check the fuel pump module

To check the fuel pump module, you can perform a few tests to diagnose any issues.

Firstly, check for corrosion on the electronic fuel controller. If the module is mounted flat against the metal cross-member, dissimilar metal corrosion may occur, causing a build-up that pushes the module out and cracks it.

Next, you can test the fuel pump's condition. Disconnect one of the rubber fuel supply lines in the engine bay and place the end into a clear plastic bottle. If pressurised fuel comes out, the problem is likely elsewhere. However, this is not a guarantee, as the pressure is also determined by pump health.

You can also use a multimeter and a wiring diagram to probe the wiring at the connection to see if the fuel pump is receiving power, a good ground, and the proper signal. If the pump has these, but is still not functioning correctly, then the pump is likely bad.

Another test involves disconnecting the fuel pressure sensor. Without the pressure sensor, a check engine light will likely appear, but the ECU will assume a worst-case scenario and order the fuel pump to run at full pressure. If your car runs better without the sensor, the fuel pump module may be faulty.

Finally, you can test the fuel pump's output by measuring how much fuel it can deliver. A good pump should deliver a quart of fuel in 30 seconds.

Check the PCM

The Powertrain Control Module (PCM) is an important component of your F150's electronic returnless fuel supply system. It collects data from various sensors, such as the fuel rail pressure sensor and fuel temperature sensor, to determine how much fuel pressure is needed. This information is then sent to the Fuel Pump Driver Module (FPDM), which controls the fuel pump accordingly.

To check the PCM, you can start by locating it in your vehicle. Refer to your user's manual to find its exact location, as it may vary depending on the model of your F150. Once you have located the PCM, you can perform a visual inspection for any signs of damage or corrosion. Look for any cracks, leaks, or loose connections.

If everything appears to be in order visually, you can move on to testing its functionality. You will need a multimeter to do this. First, check for continuity between the PCM and the ground. Set your multimeter to test resistance and probe the PCM, then touch the other probe to a clean spot on the chassis. If there is no continuity, you may need to clean or replace the ground connection.

Next, switch your multimeter to test voltage. With the key in the "on" position, check for voltage at the PCM. It should show a reading of around 12 volts. If you do not get this reading, there may be an issue with the power supply to the PCM.

Additionally, you can refer to any error codes that your vehicle may be displaying. Error codes such as P0093 ("Fuel System Large Leak Detected") or P008A ("Low-Pressure Fuel System Pressure - Too Low") can indicate issues with the fuel system, which may be related to the PCM.

If you suspect that your PCM is faulty, it is best to consult a licensed mechanic for further diagnosis and repair.

Frequently asked questions