If you are aware of abnormal signs on your car, you are right to be concerned, because a car represents a big annual budget and unpredicted malfunctions don’t lower the bill. So what if you think that you have a leaking injector on your GMC Sierra? You likely figured it out thanks to black/oily drips along your engine motor, or a troubled idle, or strange black smoke. These three signs of illness are the main signs of a leaking injector. As this troubles can bring on more severe engine complications on your car, we chose to publish this article content to help you validate the failure of a leaking injector and deal with it properly. To accomplish this, we will initially look at the circumstance of gasoline injectors and then at those of diesel injectors GMC Sierra.
Leaking injector on my petrol GMC Sierra
It is essential to know that the injectors on petrol and diesel engines are distinct, the reality is, the difference in combustion between these two types of engines makes the injection distinct. The biggest difference lies in the pressure experienced 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 Sierra: The different leaks
It should be mentioned that injector leaks on a GMC Sierra equipped with a petrol engine are rather infrequent. This is because of 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 plausible that you have a leak from the top of the injector, this is the component that is attached 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 portion of the injector of your car, this one will occur from the junction with the engine and not with the rail as seen before.
Leaking injector on my diesel GMC Sierra
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system 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 Sierra: The different leaks
In the circumstance of leaking diesel injectors on your GMC Sierra, there are three several types of leaks:
- Leakage from the injector inlet:
In this instance, it is an inlet pipe that will deform as time passes, usually the leak will be at the clamping point. - Injector return leakage:
As its name reveals, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your GMC Sierra will be a consequence of an O-ring or its plastic tip that leaks. - Injector base leak:
This injection leak is one of the most troublesome, 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 checking you have oil leaking but it does not come from your injectors, we advise you to consult this article content on the existence of oil leaking on your GMC Sierra.
Leaking injector on my GMC Sierra, how to fix the leak
And at last, we’re going to look at how to fix a leaking injector on your car. Very often a leak is associated, as we have seen prior to this, to a worn seal because of the pressures suffered. But think that the pressure in the circuit is enormous, specifically on diesel engines. So you will have to take some precautions:
- Lower the pressure before any work is achieved…
- Covering 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 regularly be restricted to changing the seals that have failed:
- Discover 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 respect with the manufacturer’s standards.
In all cases, these interventions are not automatically very hard, but if you have the tiniest hesitation in the treatment of your injector that leaks on your GMC Sierra, we advise you to get closer to your mechanic to avoid any bad handling that could critically harm the condition of your GMC Sierra.
Whenever you have any additional questions about the GMC Sierra, do not hesitate to consult our GMC Sierra category.
