If you are aware of unusual symptoms on your car, you are right to be worried, because a car represents a massive annual budget and unforeseen breakdowns don’t reduce the bill. So what if you find that you have a leaking injector on your Ford Fiesta 4? You likely figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or unconventional black smoke. These three signs of illness are the main indicators of a leaking injector. As this problem can lead to more critical engine complications on your car, we decided to write this content to help you validate the failure of a leaking injector and handle it properly. To do this, we will first of all look into the case of gasoline injectors and then at those of diesel injectors Ford Fiesta 4.

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Leaking injector on my petrol Ford Fiesta 4

It is vital to know that the injectors on petrol and diesel engines are different, actually, the difference in combustion between these two kind of engines makes the injection different. 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 Ford Fiesta 4: The different leaks

It should be said that injector leaks on a Ford Fiesta 4 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 kind 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 experience a leak coming from the lower part of the injector of your car, this one will come from the junction with the engine and not with the rail as seen previously.

Leaking injector on my diesel Ford Fiesta 4

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system creates 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 Ford Fiesta 4: The different leaks

In the case of leaking diesel injectors on your Ford Fiesta 4, there are three several kind of leaks:

  • Leakage from the injector inlet:
    In this instance, it is an inlet pipe that will deform with time, commonly the leak will be at the clamping point.
  • Injector return leakage:
    As its name reveals, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Ford Fiesta 4 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 experience an air noise and a compression loss.
  • If after examining you have oil leaking but it does not come from your injectors, we recommend you to browse this content on the existence of oil leaking on your Ford Fiesta 4.

Leaking injector on my Ford Fiesta 4, how to fix the leak

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

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

  • Find out the source of the leak
  • Take apart the injector in question
  • Change the corresponding seal kit
  • Reassemble the set up and tighten with a torque wrench in respect with the manufacturer’s standards.

In all cases, these interventions are not necessarily difficult, but if you have the smallest uncertainty in the treatment of your injector that leaks on your Ford Fiesta 4, we recommend you to get closer to your repair shop to avoid any bad handling that could critically harm the condition of your Ford Fiesta 4.

If you wish more tutorials on the Ford Fiesta 4, go to our Ford Fiesta 4 category.