Resistance Fuel Level Sensor

Regular price $11.99

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Mainly technical parameters:

Product name

0-180¦¸ resistive fuel tanker level sensor for truck

Key words

Fuel tanker level sensor



Power supply

5-24VDC (standard)

Output signal


Measuring range


Compensation temperature


Medium temperature


Environment temperature


Measuring media

Liquid,Water, diesel, petrol, oil, etc


5mm, 7mm, 10mm, 21mm

Zero tempe drift


Sensitivity temperature drift



Stainless steel



Long-term stability


Inherent frequency


Measurement method

The probe sinks into the bottom of the liquid.

Protection grade


The length, accuracy and output range can be customized.

The sensing system is located in the fuel tank and consists of a float¡ªusually made of foam and connected to an actuating metal rod¡ªattached to a variable resistor. The variable resistors used in fuel levels sensors are often composed of a resistive material, where one end is attached to the ground, with a wiper (much like a very small windscreen wiper) that moves over the resistive material as the float moves. When the float moves due to changing fuel levels, the wiper moves across the resistor, causing a change in voltage. The orientation of the wiper means that the highest resistance is experienced across the resistor when the tank is empty. At this point, the wiper is also as far away as possible from the ground end of the resistor. The change in current is then passed on to the indicator which in turn changes the reading.

However, fuel level sensors in automobiles can often be inaccurate, especially when driving with a full tank. In this scenario, the float will rise to the top of the tank, with the wiper returning to the ground end of the resistor, resulting in a small resistance and a high current passing through the sensor. As the float drops in height, the resistance changes; but the gauge will often remain on 'full' for some time. This is because when the fuel tank is full, the float cannot position itself on top of the fuel, as it is blocked by the tank or is limited by the reach of the actuating rod attached to it; meaning that the float becomes submerged when the tank is full. This leads to inaccurate readings until the fuel drops to a level where the float can sit on top, allowing the resistance to change.

Similarly, when fuel is low, the rod often does not extend to the end of the tank, causing the gauge to indicate an empty tank when actually some fuel remains.

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