# Fuel injector

> A fuel injector is the solenoid valve in fuel-injected engines that sprays pressurised fuel into the intake on command from the engine control unit (ECU).

- **Also known as:** Enjeksiyon, Yakıt enjektörü, Injector, EFI
- **Turkish term:** Enjektör
- **Category:** [Injectors & Throttle Bodies](https://motorsikletparcasi.com/en/category/injectors-and-throttle-bodies)
- **Page:** https://motorsikletparcasi.com/en/glossary/fuel-injector

In a fuel injection system the [fuel pump](https://motorsikletparcasi.com/en/glossary/fuel-pump) supplies fuel to the injector at constant pressure, and the ECU sets how long the injector stays open based on its sensors (throttle position, air temperature, engine temperature, oxygen sensor). This keeps the mixture more precise than a carburettor in all conditions.

## Symptoms of a problem

- Hunting idle, misfiring, bogging when you open the throttle
- Higher fuel consumption
- Hard starting

Dirty fuel and long storage can clog the nozzle; injectors can be cleaned ultrasonically or replaced. Always renew the O-ring seals when refitting an injector.

## Related terms

- [Throttle body](https://motorsikletparcasi.com/en/glossary/throttle-body): The throttle body controls how much air enters a fuel-injected engine using a butterfly valve linked to the twist grip.
- [Fuel pump](https://motorsikletparcasi.com/en/glossary/fuel-pump): The fuel pump is the electric pump in fuel-injected motorcycles that delivers fuel from the tank to the injector at constant pressure.
- [Carburettor](https://motorsikletparcasi.com/en/glossary/carburettor): A carburettor is the mechanical fuel system component that mixes petrol into the incoming air in the correct proportion.

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- Source page: https://motorsikletparcasi.com/en/glossary/fuel-injector
- Last updated: 2026-10-09
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