The fuel injector is now found in the combustion chamber – having previously been located in the intake manifold – and plays a vital role in how fuel is dispensed/released into the engine. Without a fuel injector, the correct amount of fuel would not be delivered. A bad/broken injector can cause havoc to an engine and on many occasions may have to be replaced immediately.

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Theoretically, a fuel injector should last as long as the car/engine; however, the reality is that this is rarely the case. This is mainly because of the prevailing conditions that cars are used in. Pollution, dirt particles, water and other debris can all contaminate the fuel, which impacts the health of the fuel injector. Poor-standard petrol, destructive driving circumstances and the overall condition of a vehicle can also contribute to premature fuel injector failure.

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How long should they last?

The fuel injectors on a car will typically last between 50,000 and 100,000 miles. Factors that influence this include the type of fuel that is used and how often the various fuel filters are changed. Lower quality petrol will often cause the fuel injectors to become clogged/gummed up.

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How can you delay degradation?

There are a few simple things you can do that will help to reduce degradation. These include – but are not limited to – buying high-quality fuel, regularly changing your fuel filter, adding fuel injector cleaner to your tank, and cleaning your fuel injectors.

There are several injector treatments available on the market that are designed to break up deposits; however, even these treatments won’t be effective if the injectors will need to be changed.

Replacement

Although fuel injectors are individual parts, they are designed to work together. Unfortunately, this means that if one is broken or damaged, all will need to be replaced. The cost of replacement depends on the make, age and model of your car. The average cost for a full replacement ranges from £600 to £1100.

Warning signs

Several signs may indicate that the fuel injector needs to be replaced. These include a stalling or misfiring engine, poor fuel economy, and leaking fuel.