In the event you are aware of irregular symptoms on your car, you are right to be intrigued, because a car represents a huge annual budget and unforeseen breakdowns don’t lower the bill. So what if you feel like you have a leaking injector on your GMC Yukon? You almost certainly figured it out thanks to black/oily drips along your engine unit, or a troubled idle, or unusual black smoke. These three symptoms are the main signals of a leaking injector. As this problem can cause more significant engine complications on your car, we chose to write this content to help you ensure the failure of a leaking injector and handle it properly. To do so, we will first check out the circumstance of gasoline injectors and then at those of diesel injectors GMC Yukon.

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Leaking injector on my petrol GMC Yukon

It is essential to know that the injectors on petrol and diesel engines are different, the reality is, the difference in combustion between these two sort of engines makes the injection different. The main 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: The different leaks

It should be noted that injector leaks on a GMC Yukon equipped with a petrol engine are rather rare. This is because of the much lower pressure in the petrol intake systems. However, there are two sort of leaks:

  • Leakage from the top of the injector:
    It is possible that you have a leak from the top of the injector, this is the portion that is linked to the fuel rail, an O-ring will be involved in this.
  • Leak injector of the lower part:
    At last, you may encounter 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

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure produces 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: The different leaks

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

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform after a while, in most cases the leak will be at the clamping point.
  • Injector return leakage:
    As its name suggests, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your GMC Yukon 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 experience an air noise and a compression loss.
  • If after verifying you have oil leaking but it does not come from your injectors, we suggest you to read this content on the existence of oil leaking on your GMC Yukon.

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

And finally, we’re going to check out how to fix a leaking injector on your car. Regularly a leak is connected, as we have seen prior to this, to a worn seal as a result of the pressures suffered. But think that the pressure in the circuit is enormous, especially on diesel engines. So you will have to take some precautions:

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

Regarding the repair part of your leak, it will oftentimes be limited to changing the seals that have failed:

  • Locate the source of the leak
  • Dismantle the injector in question
  • Replace the corresponding seal kit
  • Reassemble the set up and tighten with a torque wrench in accordance with the manufacturer’s standards.

In all situations, these interventions are not necessarily very hard, but if you have the tiniest doubt in the treatment of your injector that leaks on your GMC Yukon, we suggest you to get closer to your repair shop to avoid any bad handling that could critically harm the condition of your GMC Yukon.

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