The attitude of car repairers when they see French cars most of the time is to stay away from them, because many designs are "anti-human thinking". For example, it is generally accepted that such designs are reasonable, but French engineers must design another one with their own ingenuity, and some ingenious designs are redundant, which will only add to the car owners' worries.

Today, a sign 3008 came. The female car owner has been very worried recently. The main problems are three: the engine fault light is on, the wiper can't spray water, and the sound of plastic cup flattening at the rear of the car is always heard.

The first two faults are that the rear oxygen sensor and the wiper spray motor are broken. This is normal damage. There is nothing to say. The key is the third point. There is a sound of plastic cup flattening at the rear. It is very interesting. In fact, this sound is the sound of plastic when the fuel tank is sucked flat. Then why is the fuel tank sucked flat? So I have to admire the brainhole opening design of French engineers.

The fuel tank ventilation system of French cars is different from that designed in other countries. One pipe is directly connected to the atmosphere, the other end of the pipe is connected to the carbon canister, and then to the fuel tank after passing through the carbon canister. So when the original car was designed, the air pipe was equipped with a dust filter, but our air is more damaged, and it is easy to block the dust filter element. Once blocked, it is equivalent to choking the ventilation end, forming a vacuum in the fuel tank, which will flatten the fuel tank.

So the French engineer did something to hide his ears and steal the truth. He directly removed the dust filter element. In this way, the carbon canister would directly contact with the air with dust. Over time, the carbon canister was blocked by dust, which still caused the fuel tank to suck flat. This car is the product of a French engineer who has kept his ears shut. There is no dust filter element. We use an endoscope to look inside the carbon canister. The dust seals the inlet like cement, causing the fuel tank to become stuffy and flat.

Now that we know the problem, we should apply the right medicine to the case, directly replace the blocked carbon canister, and then add a dust filter element to the vehicle. The flattened fuel tank can no longer pop out, but at least it can ensure that the flattening will not continue to increase. Once the fuel tank is flattened to a certain extent, it will squeeze the oil pump, resulting in inaccurate fuel gauge count, and even cause the oil pump to be flattened and damaged.