Unlike oil or water coolant, fuel flows in a one-way path. Fuel does not circulate the engine block, but rather it is consumed inside the engine. An unclean fuel will result in inefficient combustion. This will produce unclean exhaust gases that are high in pollutants. Unclean fuel will slow down the process of combustion, thereby reducing the engine output. Unclean fuel will also produce residues that can cause deterioration of the internal moving parts of the engine. The pistons and valves may eventually be clogged by the accumulated combustion residues. Impurities in fuel such as rust, dust, debris and moisture may be accidentally mixed with the fuel during fuel refill.

On the other hand, some impurities such as rust and moisture may be formed inside the fuel tank itself. Moisture, for instance may be formed from humid air inside the fuel tank. When the temperature significantly drops, the water vapor in the air will condense on the internal walls of the fuel tank. This moisture can easily get mixed up with the fuel. The moisture formed inside the fuel tank may also cause the formation of rust on the internal walls. Rust chips may eventually fall off and get mixed with the fuel. If these impurities are not removed, they will be burned along with the fuel. These impurities can drastically affect the efficiency of combustion and they could clog the internal moving parts.

Rust and debris can increase the abrasiveness of the pistons, thereby increasing friction. This may lead to overheating that could directly cause the pistons to expand. Hence, it is necessary to screen out any impurities or contaminants on the fuel before it is allowed to enter the combustion chambers. A fuel filter such as the Hyundai fuel filter screens out any dirt or contaminants that may get mixed with the fuel. A fuel filter is generally located near the fuel tank. It is a cylindrical structure that is comprised by a paper filtering medium, a porous canister containing the filtering medium and a plastic or metal housing with pressure valves.

To maximize surface area, the paper filtering medium is folded in a certain way. The folds efficiently trap solid contaminants. On the other hand, the liquid contaminants are absorbed by the fibers of the filtering medium while allowing fuel to pass through. Some fuel filters also feature a water drain collector that can be unplugged to remove water from the fuel. It is very important that the fuel filter must be regularly checked and cleaned to maintain its optimal performance. Parts Train offers only the best aftermarket fuel filters at very reasonable price.