There are many moving parts inside an injector, and over time they can fail due to normal wear and tear or lack of maintenance. Internal Part Failure – What causes a fuel injector to fail? The other way an injector will leak is if the injector body or nozzle cracks. This can be dangerous and is a common cause of engine fires. If it breaks, then fuel can leak out over the engine. This can become hard and brittle from the heat of the engine.

The most common cause of leaky injectors is the failure of the O-ring where the injector meets the fuel rail. Leaking Injectors – What causes a fuel injector to leak? Over time, these will eventually block the injector. This causes any fuel left in the injector to evaporate, leaving behind hard deposits inside the injector. When you shut off your engine, the injector will soak up the heat of the engine. This is caused by the burning of hydrocarbons that are present in the fuel, flowing through the injector. Over time the nozzle of the injector can become dirty, and partially blocked. Dirty/Clogged Injectors – What causes a fuel injector to become blocked? Here’s a list of the most common reasons why a fuel injector fails: 1. It will either become clogged internally, or will fail mechanically.

Why Causes a Bad Fuel injector?Ī fuel injector will usually only fail in one of two ways. This increases the chances of failure over time. In modern common rail diesel engines, fuel pressures can be over 25,000 psi.īecause the injector is seated in the top of the engine cylinder, it is constantly exposed to heat and pressure. When the needle valve is opened, fuel under enormous pressure is sprayed into the combustion chamber. The opening and closing of the valve is operated by a solenoid. It arrives via a nozzle that is opened and closed with a needle valve.

So it is vital the each part of the system, including each injector are operating properly.įuel from the tank is routed to the injector and sprayed into the combustion chamber. The whole process involves the complex interaction of all parts of the fuel management system, under the control of the ECU. Most modern engines use a technique known as direct injection to get the fuel into the engine chamber. The job of a fuel injector is to deliver fuel to the combustion chamber of the engine at a controlled rate and in the right amount. If the fuel injector is not operating properly, then other parts of the engine will be affected and over time can be damaged. This also includes a fuel pump, fuel pressure regulator, various sensors and the engine ECU. They are a vital part of a complex fuel management system. In a bid to reduce exhaust emissions, manufacturers were forced to change how fuel consumption was controlled by engines.įuel injectors are now used in pretty much all passenger vehicles. Up until the 1980’s, fuel injection was controlled in most engines by a carburettor. A bad fuel injector will wreak havoc with how your engine runs, and will likely leave you stranded on the side of the road. Fuel injectors are used in all modern engines, and are a vital component in the fuel management system.

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