Why Ford Diesel Injectors Fail

Diesel fuel injectors are a key part of the engine. When they don’t work correctly, your Power Stroke may not run right, or even start. Here is what you need to know about diesel injectors failing to work, and what you can do about it.

Diesel Injector


One of the most common problems with diesel injectors is erosion of the control valve. A diesel injector has a small valve that allows fuel to pass through it under extremely high pressure. Over time, the passage of this fuel wears down the valve. This erosion leads to the pressurized ball within the injector to not seal correctly.
Typically, you will know your injectors have failed by:

  • Excessive smoke
  • Starting and/or idling problems
  • Potential engine failure

The solution to this problem is replacement. Check out our Ford Power Stroke part specials to find a deal on OEM replacement diesel fuel injectors for your Ford truck.

Bad Fuel

Another common diesel injection problem is purchasing a bad batch of diesel fuel. Diesel fuel by definition is less refined than gasoline. With the less refinement, you can run across a bad batch every once in a while. This fuel often has harmful contaminants that can speed erosion of the control valve and/or damage the fuel system.
Common issues related to bad fuel are:

  • Corrosion from excessive water through the delivery system and/or tank vent
  • Micro-fine particles in the fuel
  • Improper fuel storage

The solution to this problem is to always purchase fuel from a reputable service station. Also, periodically inspect the tank vent.

Incorrect Installation

Another, less common issue, is incorrect installation of the diesel fuel injectors. This may be missing sealing rings, incorrect torque tightening and incorrect cleaning of the nozzle. These problems can cause:

  • Poor performance
  • Misfire
  • Black smoke
  • Check engine light illuminated

If this is your problem, the solution is to find a reputable diesel mechanic and have the fuel injectors replaced and/or properly installed.

Non-OEM Aftermarket Products

One factor to consider is what type of replacement diesel fuel injectors are in your system. While aftermarket parts can save some money, you are taking a risk when it comes to engine performance. Manufacture replacement parts are the best solution when replacing parts since they have been developed and tested specifically with your vehicle in mind.

Buying inferior parts can lead to performance issues and long-term engine damage.