How to Distinguish Automotive Fuel Lines?
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Normally, the fuel inlet line is located above the fuel injector, while the return line is positioned below and branches out from the interior. Additionally, the fuel inlet line is generally larger in diameter than the return line, with the inlet line being the one connected to the fuel filter. Fuel lines are routed from the fuel tank to the engine compartment at the front of the vehicle, or in some models, they are externally mounted on the chassis, running through these recesses towards the engine. Some automakers design protective shields for these lines. More details are as follows: 1. The gasoline line connects the fuel pump to the engine's fuel injectors to supply fuel. There is also the power steering line, which provides hydraulic fluid to the steering gear to reduce steering resistance. The brake fluid line connects the brake master cylinder to the brake calipers; when the brake pedal is pressed, the master cylinder applies pressure through the brake fluid to the brake pads, which then clamp the brake rotor to slow or stop the vehicle. Essentially, these are the three main types of fluid lines. 2. Gasoline lines are divided into inlet and return lines. The line connected to the fuel filter and the fuel pump is the inlet line, while the thinner line returning from the fuel injector is the return line. The purpose of the return line: When the fuel pressure provided by the fuel pump exceeds 100 to 150 kPa, the overflow valve in the fuel filter's return line opens, allowing excess fuel to flow back to the fuel tank via the return line.