If you are aware of unusual signs on your vehicle, you are right to be concerned, because a car represents a huge annual budget and unexpected malfunctions don’t reduce the costs. So what if you think that you have a leaking injector on your Peugeot 307? You likely figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or unusual black smoke. These three symptoms are the main signals of a leaking injector. As this troubles can bring about more serious engine problems on your car, we thought we would prepare this content to help you confirm the failure of a leaking injector and treat it correctly. To do this, we will first take a look at the case of gasoline injectors and then at those of diesel injectors Peugeot 307.


Leaking injector on my petrol Peugeot 307

It is important to know that the injectors on petrol and diesel engines are distinct, in reality, the difference in combustion between these two sort of engines makes the injection distinct. 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 Peugeot 307: The different leaks

It should be mentioned that injector leaks on a Peugeot 307 equipped with a petrol engine are rather infrequent. This is due to the much lower pressure in the petrol intake systems. Even so, there are two sort 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 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 suffer 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 sooner.

Leaking injector on my diesel Peugeot 307

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 Peugeot 307: The different leaks

In the case of leaking diesel injectors on your Peugeot 307, there are three different sort of leaks:

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform along with time, commonly 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 Peugeot 307 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 recommend you to browse this content on the existence of oil leaking on your Peugeot 307.

Leaking injector on my Peugeot 307, how to fix the leak

And finally, we’re going to take a look at how to fix a leaking injector on your car. Oftentimes a leak is connected, 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 gigantic, specifically on diesel engines. So you will have to take some measures:

  • 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.

Relating to the repair part of your leak, it will frequently be restricted to changing 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 accordance with the manufacturer’s standards.

In all situations, these interventions are not specifically very hard, but if you have the tiniest doubt in the treatment of your injector that leaks on your Peugeot 307, we recommend you to get closer to your motor mechanic to avoid any bad manipulation that could severely harm the condition of your Peugeot 307.

To get more tips on the Peugeot 307, take a look at the Peugeot 307 category.