In the event that you are alert of abnormal symptoms on your car, you are right to be preoccupied, because a car represents a massive annual budget and unexpected breakdowns don’t reduce the expenses. So what if you find that you have a leaking injector on your Infiniti QX30? You probably figured it out thanks to black/oily drips along your engine, or a troubled idle, or unconventional black smoke. These three signs of illness are the main signs of a leaking injector. As this troubles can lead to more critical engine trouble on your car, we thought we would compose this content to help you verify the failure of a leaking injector and treat it correctly. To accomplish this, we will initially check out the case of gasoline injectors and then at those of diesel injectors Infiniti QX30.


Leaking injector on my petrol Infiniti QX30

It is fundamental to know that the injectors on petrol and diesel engines are different, in fact, the difference in combustion between these two types of engines makes the injection different. The essential 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 Infiniti QX30: The different leaks

It should be noted that injector leaks on a Infiniti QX30 equipped with a petrol engine are rather rare. This is due to the much lower pressure in the petrol intake systems. Even so, 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 component that is connected to the fuel rail, an O-ring will be involved in this.
  • Leak injector of the lower part:
    Finally, you may encounter a leak coming from the lower part of the injector of your car, this one will occur from the junction with the engine and not with the rail as seen sooner.

Leaking injector on my diesel Infiniti QX30

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 Infiniti QX30: The different leaks

In the case of leaking diesel injectors on your Infiniti QX30, there are three several types of leaks:

  • Leakage from the injector inlet:
    In this case, 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 indicates, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Infiniti QX30 will be caused 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 find an air noise and a compression loss.
  • If after verifying you have oil leaking but it does not come from your injectors, we recommend you to consult this content on the presence of oil leaking on your Infiniti QX30.

Leaking injector on my Infiniti QX30, how to fix the leak

And to finish, we’re going to check out how to fix a leaking injector on your car. Oftentimes a leak is linked, as we have seen sooner, to a worn seal caused by the pressures suffered. But think that the pressure in the circuit is tremendous, specifically on diesel engines. So you will have to take some safety measures:

  • Lower the pressure before any work is carried out…
  • 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 oftentimes be restricted to swapping the seals that have failed:

  • Situate 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 cases, these interventions are not necessarily very hard, but if you have the slightest doubt in the treatment of your injector that leaks on your Infiniti QX30, we recommend you to get closer to your mechanic to avoid any bad handling that could seriously harm the condition of your Infiniti QX30.

If you wish more guides on the Infiniti QX30, go to our Infiniti QX30 category.