I don't often patronize automated car washes, but shortly after our last snow/salt event I had a free coupon and a dirty car and it was too cold to do it myself. When I emerged I discovered the fuel door had opened because of some pressure, at what stage I do not know, but fortunately no water entered the fuel system. If you plan to use one, press the lock button before you reach any water.
Car Wash Warning: Fuel Door May Open
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Under any water pressure (automatic or manual wash for example) the jet is directed at an angle to the surface of the machine. I not only had the fuel tank door open from this force, I even had badges flying off the car because of the power of the pressure. But I asked the washers to direct the water so that it would flush the dirt to the side where the fuel tank lid is closed. Since I don't have an interlock, I had to ask them to do it every time. A lot of people didn't like it, it wasn't their job. And at sparklewash.com they told me that using a high-pressure washer properly does not have these consequences and even with the door open, no water gets into the interior of the car to wash the sills. It does.
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