Fuel level indication noise monitor

摘要

Methods and systems are provided for monitoring fuel level indicator noise in a sealed fuel tank system. In one example, the method includes comparing the outputs of a fuel level indicator and fuel tank pressure sensor in a sealed tank. If the outputs of both the fuel level indicator and the fuel tank pressure sensor outputs are noisy, then it may be determined that the fuel level indicator noise is mechanical in nature. However, if the fuel level indicator output is noisy while the fuel tank pressure sensor output is not noisy in the sealed tank, then it may be determined that the fuel tank pressure sensor noise is electrical in nature.

主权项

1. A method for an engine fuel system, comprising:
indicating degradation of a fuel tank fuel level indicator based on each of a fuel level indicator output and a fuel tank pressure sensed in a sealed fuel tank system.