This line basically sends unused fuel from the engine’s fuel rail back to the fuel tank. Modern fuel injection systems send more fuel than the engine actually burns at any given moment – it’s how they keep everything cool and responsive. The return line is the pathway for that excess fuel to cycle back, so it doesn’t build up pressure or cause problems. It’s a simple concept, but vital to how the whole fuel system works. Think of it as part of a closed loop. The fuel pump sends fuel to the engine, the engine uses what it needs, and this line brings the leftovers back to the tank to be reused. It’s usually a flexible line, often rubber or a special composite material, because the engine moves and vibrates. It connects the fuel rail – where the injectors are – back to the fuel tank, and it’s under constant fuel pressure, so it needs to be reliable. If this line fails, you’ll notice it pretty quickly. Usually, it'll start with a fuel leak – obviously a safety hazard and a messy one. But even a small leak can really throw off your engine’s performance. You might experience rough idling, a loss of power, or trouble starting. The fuel pressure won’t be regulated properly. It acts like a shield against pressure build – up, so if it goes, the whole system is vulnerable. You can find replacements pretty easily, Fixparts Online has a good selection, but it’s something you want to address as soon as you suspect an issue. Don't put it off; a fuel leak is serious. Adaptable to any vehicle: Fuel Return Line (MPN 0445130090) comes with a 12-month warranty!

About Bosch

Robert Bosch GmbH is a global leader in automotive technology, offering high-quality parts and systems that enhance vehicle efficiency, safety, and reliability.

Why Choose Bosch?

• Bosch parts are known for lasting a long time, so you won't have to replace them often. • They're made with high-quality materials and tested thoroughly, meaning they perform reliably. • Bosch offers a wide range of parts, so you're likely to find what you need for almost any vehicle. • Mechanics and drivers around the world trust Bosch – it’s a name you can depend on. Performance you can rely on – Bosch parts from FixParts Online.