Fuel Sending Unit

The Fuel Sending Unit is responsible for sending an electrical signal to the fuel gauge to indicate the level of fuel in your tank. The fuel sending unit uses a variable resistance to generate the variable electric current to indicate the fuel level. The mechanism consists of a foam float that is connected to a thin, metal rod. The end of the metal rod is connected to the variable resistor. A wiper, that slides on the metal strip, is connected to the gauge and conducts electricity from the gauge to the resistor. When the tank is full, the wiper is closest to the ground and the resistance is at the minimum while the current is at its maximum, therefore making the gauge indicate the tank is "full".

When the fuel level becomes low, the float begins to drop, moving the metal arm. Thus, the wiper begins to move away from the ground, introducing more resistance into the circuit, and decreasing the current flowing through the gauge. Thus as the fuel level drops, the gauge needle begins creeping towards the "Empty" indicator. Though, it's a conventional module, there are innacuracies associated with this system. Owing to the fact that the fuel level indication is dependent on the position of the floating ball, the indications of a full and empty tank on the gauge is not consistent with the actual level of fuel in the tank.

If you find that your fuel gauge indicator seems to be stuck in a single position, full or empty, it could be an indication of short circuit or defect in wiring of the sending unit. If the gauge sticks in one position and returns to normal after a little while, it is likely due to a mechanical fault in the float arm. In either of the above mentioned cases, you should check your fuel sending unit. At Buy Auto Parts we stock a wide variety of fuel sending units for every car make and model.

We have genuine OEM replacements and premium aftermarket parts. All our car parts are thoroughly tested and come with a warranty. To view the parts that fit your vehicle, select the right year, make and model of your car on our online catalog. At Buy Auto Parts you will find high-quality fuel sending units at unbeatable prices, and free shipping. If you have any questions about our car parts, call our toll-free support line 1-888-907-7225 or email us at [email protected].