Patent ID: 7990275
Filing Date: 2011-08-02
Classification: F02M

Abstract:
1. A pressure indicator for a fuel tank, comprising: pressure sensors, processing chips, transmitters, batteries and wires in a component selected from the group comprising gaskets and washers for a cap that closes an opening of a fuel tank; wherein the processing chips cause the transmitters to send a signal to a receiver when the sensors detect that pressure in a fuel tank is below a predetermined level, the batteries supply power to the sensors, the processing chips and the transmitters, and the wires electrically connect the batteries, the sensors, the processing chips, and the transmitters; and when the signal is received by the receiver, whether or not the pressure in the fuel tank is below the predetermined level is indicated on a fuel cap, by a wheel that turns with change of Pressure, said wheel having a red area indicating low pressure, and a green area indicating normal pressure, with the red or green area being displayed through a window in the fuel cap; wherein the fuel cap emits a sound indicating when it has been screwed to a correct tightness, when being replaced to cover the fuel tank after refueling; wherein there is an alarm when the fuel cap has no been screwed to a correct tightness; wherein inside of a door covering the fuel cap there is a marking indicating the correct position to which the fuel cap should be rotated to close it and seal the fuel tank; and wherein there is a movable washer in the fuel cap that can seal the fuel cap when it is loose, said movable washer being activated when a user pushes a button after an indicator shows that the fuel cap is loose after the receiver receives the signal.