Many car owners are faced with such a common problem when a characteristic “zilch” occurs when opening the gas tank cover.
At the same time, it is very difficult to determine exactly what it is connected with: either it is a vacuum, or an overpressure in the tank. However, there is one simple and proven way.
In order to understand why this same “zilch” occurs, it is necessary to understand, it pulls inward or, on the contrary, throws out pressure.
How to do a quick diagnosis
This is done very simply. The first step is to unscrew the gas tank cap. You need to wear a rubber glove on the neck or you can use a balloon. A simple condom is also suitable.
After putting on a rubber glove and fixing it for reliability with an elastic band, you need to start a car. It is advisable that he idle for about 5-7 minutes.
If the rubber glove begins to be pulled inward, then a vacuum occurs in the gas tank. If the glove, on the contrary, starts to blow out, it means that an excess pressure has appeared in the tank. Here is such an easy way to diagnose whipped up.
What is the cause of rarefaction and overpressure
If excessive vacuum is created inside the gas tank, the most likely cause is a plug malfunction. That is, it can be like a clogged filter in the gas tank cover itself, or a valve malfunction.
The most common cause of high pressure in the tank is clogging of the filter element or failure of the adsorber solenoid valve. If you are interested in more detailed information on this topic, be sure to watch this video.
