Fuel gauge Totally Explained

Everything about Fuel Gauge totally explained

A fuel gauge (or gas gauge) is an instrument used to indicate the level of fuel contained in a tank. Commonly used in cars, these may also be used for any tank including underground storage tanks.
As used in cars, the gauge consists of two parts:

The sender unit
The indicator

The sending unit usually uses a float connected to a variable resistor. When the tank is full, the resistor is set to its low resistance value. As the tank empties, the float drops and the slides a moving contact along the resistor, increasing its resistance, finally reaching its highest value when the tank is empty. In addition, when the resistance is at a certain point, it'll also turn on a "low fuel" light on some vehicles.
   Meanwhile, the indicator unit (usually mounted on the instrument panel) is measuring and displaying the amount of electrical current flowing through the sending unit. When the tank level is high and maximum current is flowing, the needle points to "F" indicating a full tank. When the tank is empty and the least current is flowing, the needle points to "E" indicating an empty tank.
   The system is fail safe; a fault that opens the electrical circuit causes the indicator to show the tank as being empty (which will provoke the driver to refill the tank) rather than full (which would allow the driver to run out of fuel with no prior notification).
   Systems that measure large fuel tanks (including underground storage tanks) may use the same electro-mechanical principle or may make use of a pressure sensor, sometimes connected to a mercury manometer.
   Large airplanes use a different fuel gauge design principle. An airplane has a few (around 30 on an A320) low voltage capacitors where the fuel can go between them. At different fuel levels there are different capacitances (for example capacitance proportional to the height of fuel) and therefore the level of fuel can be determined. For the aircraft pitch and roll attitudes the fuel computer works out how much fuel there's (slightly different on different manufacturers). In total this is more than 99% accurate.

Further Information

Get more info on 'Fuel Gauge'.

External Link Exchanges

Do you know how hard it is to get a link from a large encyclopaedia? Well we're different and will prove it. To get a link from us just add the following HTML to your site on a relevant page:

<a href="http://fuel_gauge.totallyexplained.com">Fuel gauge Totally Explained</a>

Then simply click through this link from your web page. Our crawlers will verify your link, extract the title of your web page and instantly add a link back to it. If you like you can remove the words Totally Explained and embed the link in article text.
As long as your link remains in place, we'll keep our link to you right here. Please play fair - our crawlers are watching. Your site must be closely related to this one's topic. Any kind of spamming, dubious practises or removing the link will result in your link from us being dropped and, potentially, your whole site being banned.