In the event that you are informed of unusual symptoms on your car, you are right to be worried, because a car represents a massive annual budget and unexpected breakdowns don’t reduce the expenses. So what if you think that you have a leaking injector on your GMC Yukon XL? You almost certainly figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or abnormal black smoke. These three manifestations are the main indicators of a leaking injector. As this failure can lead to more significant engine problems on your car, we thought we would write this article to help you validate the failure of a leaking injector and treat it properly. To do this, we will first of all take a look at the circumstance of gasoline injectors and then at those of diesel injectors GMC Yukon XL.

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Leaking injector on my petrol GMC Yukon XL

It is vital to know that the injectors on petrol and diesel engines are different, in reality, the difference in combustion between these two types of engines makes the injection different. The key difference lies in the pressure undergone by the injectors, on a petrol engine it will vary between 3.5 bars for indirect injection and 120 bars for indirect injection.

Leaking injector on a petrol GMC Yukon XL: The different leaks

It should be said that injector leaks on a GMC Yukon XL equipped with a petrol engine are pretty rare. This is caused by the much lower pressure in the petrol intake systems. However, there are two types of leaks:

  • Leakage from the top of the injector:
    It is conceivable that you have a leak from the top of the injector, this is the part that is attached to the fuel rail, an O-ring will be involved in this.
  • Leak injector of the lower part:
    Finally, you may experience a leak coming from the lower part of the injector of your car, this one will appear from the junction with the engine and not with the rail as seen previously.

Leaking injector on my diesel GMC Yukon XL

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure generates very high pressure in the engine, as do the injectors. On these models, the pressure is more than 10 times higher than on the direct injection of car petrol engines, reaching 1800 to 2000 bars.

Leaking injector on diesel GMC Yukon XL: The different leaks

In the circumstance of leaking diesel injectors on your GMC Yukon XL, there are three several types of leaks:

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform in the long run, usually the leak will be at the clamping point.
  • Injector return leakage:
    As its name indicates, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your GMC Yukon XL will be brought on by an O-ring or its plastic tip that leaks.
  • Injector base leak:
    This injection leak is one of the most annoying, it is the junction between the engine and the injector nose that leaks at a copper seal, you should feel an air noise and a compression loss.
  • If after examining you have oil leaking but it does not come from your injectors, we encourage you to browse this article on the presence of oil leaking on your GMC Yukon XL.

Leaking injector on my GMC Yukon XL, how to fix the leak

And at last, we’re going to take a look at how to fix a leaking injector on your car. Frequently a leak is connected, as we have seen sooner, to a worn seal as a result of the pressures suffered. But think that the pressure in the circuit is tremendous, specifically on diesel engines. So you will have to take some measures:

  • Lower the pressure before any work is conducted…
  • Masking you to avoid the risk of fuel spillage
  • NEVER work on a running diesel engine injector.

Relating to the repair part of your leak, it will very often be limited to replacing the seals that have failed:

  • Identify the source of the leak
  • Take apart the injector in question
  • Change the corresponding seal kit
  • Reassemble the assembly and tighten with a torque wrench in accordance with the manufacturer’s standards.

In all cases, these interventions are not specifically difficult, but if you have the tiniest doubt in the treatment of your injector that leaks on your GMC Yukon XL, we encourage you to get closer to your repair shop to avoid any bad handling that could significantly harm the condition of your GMC Yukon XL.

If you want more guides on the GMC Yukon XL, go to our GMC Yukon XL category.