Lisäksi osassa autoista on ihan erillinen valvonta sille, että tankki on tiivis. Toki alipaineet ovat tosi pieniä mutta korkin kuuluu joka tapauksessa olla tiivis ja hengitys tapahtuu hallitusti EVAP-järjestelmän kautta. Jos korkki ei pitäisi alipainetta niin auto tulkitsisi tankin vuotavan.
Esimerkiksi ote Golf 7 manuaalista kohdasta joka käsittelee vuodonvalvontaa jolle on pyhitetty jopa oma ohjainlaite:
Fuel tank leak detection takes advantage of the fact that a vacuum
develops naturally in the fuel system as the fuel in the tank cools.
The variables temperature and pressure are necessary for fuel
tank leak detection. The temperature sensor is integrated into the
control unit for fuel tank leak detection - J909- . The tank pressure
sensor - G400- is fitted in the pressure control valve. The system
is deemed leak-free if 2.5 mbar vacuum is measured as the tank
temperature drops. If no vacuum develops, there is a leak in the
fuel system, and an entry will be made in the event memory of the
engine control unit.
Esimerkiksi ote Golf 7 manuaalista kohdasta joka käsittelee vuodonvalvontaa jolle on pyhitetty jopa oma ohjainlaite:
Fuel tank leak detection takes advantage of the fact that a vacuum
develops naturally in the fuel system as the fuel in the tank cools.
The variables temperature and pressure are necessary for fuel
tank leak detection. The temperature sensor is integrated into the
control unit for fuel tank leak detection - J909- . The tank pressure
sensor - G400- is fitted in the pressure control valve. The system
is deemed leak-free if 2.5 mbar vacuum is measured as the tank
temperature drops. If no vacuum develops, there is a leak in the
fuel system, and an entry will be made in the event memory of the
engine control unit.
Mitäs seuraavaksi? Polttoainepumppu ja/tai sen rele. Kampiakselin sensori. Onhan noita vaihtoehtoja.