If the filter is installed in the fuel line, it is called an external filter (External); conversely, the internal filter (Internal) refers to the filter installed inside the fuel pump and fuel tank. Among them, the fuel tank filter or its protective sleeve is generally considered to be a maintenance-free component.
The fuel filter of many imported cars uses a drum tube connection (BanjoFITtings). In order to ensure the reliability of the connection and sealing, the same gasket must not be used repeatedly. In addition, even if a brand-new gasket is used, the tightness of the connection must be checked. When the fuel system needs to replace the "O" ring, it is necessary to ensure that the specifications and model of the "O" ring are correct, and to check whether the elasticity and hardness of the ring are appropriate.
The fuel system without loop has only one internal filter (in the fuel tank). Although this all-in-one pump, filter, and delivery unit are expensive, when the fuel delivery is blocked or When the engine performance decreases due to this, proper maintenance and maintenance must be carried out in time. At the same time, it is necessary to check all the faults in the fuel line and the rupture and curling of the hose clamp.
