Fuel injectors are the components that are responsible for the final stage of fuel delivery in fuel injection systems.

So, High pressure fuel is delivered to the injector, which is activated by an engine control unit or fuel injector control module.

When activated, the injector momentarily opens a valve that allows a precise amount of fuel to spray out.

There are a few different kinds of fuel injectors, and while they all perform the same function they don’t all have the same components or design.

The three main types of fuel injectors are:

  • built into a throttle body (single point injection)
  • centrally located (central port injection)
  • located at each cylinder (multi port injection, direct injection)

Possible Reasons To Replace Fuel Injector:

  • Restrictions
  • Turbo Troubles
  • Heat Soak
  • Increase or Decrease in Long- and Short-Term Fuel Trims
  • Not Enough Resistance
  • Longer Crank Times
  • Failed Balance Tests
  • Misfire Codes
  • Vehicle Won’t Start With Full Tank
  • Lack of Maintenance


Fuel Injectors
Fuel Injectors

Some fuel injectors can fail due to simple mechanical issues. Furthermore, The most common points of failure are the result of issues like leaks and contamination. Fuel injector leaks typically occur when one of the o-rings fail.

When a fuel injector fails due to contamination it typically has to be:

  • Replaced
  • Or Cleaned

When you notice any of these symptoms with any of your vehicles or other mechanical equipment using fuel injected engines, it’s definitely a good idea to look into some injector cleaning products. However, once again it pays to emphasize the value of prevention. Proper maintenance schedule that includes regular use of injector cleaners (either liquid additives or manual cleaning kits) can go a long way in keeping your vehicles operating smoothly and reducing any repair bills down the road.

Despite the issues dirty injectors can cause, early symptoms aren’t always noticeable because modern engines have internal sensors and computers that can adjust the fuel mixture to compensate for minor errors. That can cause the beginning phases of clogging to go unnoticed.