Can you identify fake diesel filters? How bad is the fake diesel filter?

If you are on the road, suddenly encounter difficulties in starting, fuel consumption, black smoke from the exhaust pipe, etc., which seriously affects normal driving. This may be due to the installation of a fake diesel filter (ie, no inferior product), resulting in a spray. Caused by oil wear.

What is the cause of the filter paper deformation?

Before we disassemble it, we are not sure that this is a poor quality filter.
The diesel filter assembly is integrated, so it is necessary to open it with a cutting tool. After disassembling the can body, it can be clearly seen that the wrinkles on the surface of the diesel filter have been significantly deformed, and the arrangement gap of the wrinkles has become uneven. This will change the filter area of the filter and reduce the fuel throughput.


According to our experience of dismantling in the past, if it is a genuine filter cartridge, it will not happen.


It can be seen that the filter pleats are completely undeformed and the structure is very complete. What is the cause of the filter deformation?
The function of diesel filter is to filter out the impurities in the fuel. Normally, the filter element of good quality will become black and dirty after a long period of use, but the inferior filter just looks black. Foreign matter such as impurities and sludge in the fuel is not attached to the surface. Why is this again? Where are the debris in diesel?


The filter element of the genuine diesel filter should be a closed loop. The fuel entering the diesel filter must be filtered by the filter core before being delivered to the engine. The inferior diesel filter connection is not closed and is directly open, so that the diesel filter is completely lost. The fuel is not filtered through the filter paper, but directly enters the engine from the opening.

If your truck is equipped with such a diesel filter, the engine will always burn unfiltered fuel, and it will be strange if you use it for a long time. This also answers the question of why there is no impurity on the surface of the filter. As for the blackening of the color, it should be caused by long-term soaking in diesel.


The disassembly of the filter element is roughly the same as above. As for the filter paper, why is it deformed? There are mainly the following reasons. First, the strength of the filter paper itself is not easy to mutate for a long time. Secondly, the fuel passing property of the filter paper is poor, and it is easy to be deformed under the action of oil pressure. Third, the filter paper has no fixed seal, and the binder It is easy to make the filter paper deformed by falling off.

Let’s summarize some of the key points of inferior quality:

1. The filter element is not closed, so that the filter is not used, the impurities in the fuel can not be filtered out, and the engine is damaged;
2. The quality of the filter core is poor, the binder falls off, and the debris enters the engine, which easily damages the injector;
3, filter paper cut corners, the strength is not enough, it is easy to deform, reduce the filter area;
4. The rubber filter base is not provided with a rubber seal ring; some of the fuel entering the engine is not filtered;
5. The setting of the water collecting cup fixing device is unreasonable, and it cannot be disassembled normally after being soaked for a long time;
Throughout these major inferior performances, you will find that they are all inside the diesel filter, which is invisible at the time of purchase, which causes many drivers to suffer losses. The only clue we can tell the truth is the brand and the price, reminding everyone not to use the inferior diesel filter for the sake of cheapness. If the engine is faulty, the price of a diesel filter can be repaired.

Post time: Sep-30-2019