A fuel supply system has a fuel tank, a sub-tank, a fuel pump, an attachment member, and one or more shaft members. Firstly, an inner cabin image of a vehicle’s cabin is continuously captured. Use of the access point for a portable device is authenticated by requesting submission of an account identifier to the service provider and billing data for a user of the portable device for use of the access point is generated. A translation look aside buffer controller may be used to implement the method. The device may also display visual cues of the predefined gesture on the touch screen to remind a user of the gesture. The system selects one of the candidate signals based on a selected subset of previous samples and the values of the selected subset of samples.