Purpose
The fuel temperature sensor (B50) is located in the high-pressure fuel pump (M41). If the fuel temperature is too high, the pressure in the high-pressure fuel pump decreases. This reduces the amount of fuel passing through the injection pump pressure control valve (Y74) and, accordingly, reduces the fuel temperature.
VN 9.019 Fuel temperature sensor; 1. Fuel temperature sensor B50; 2. Fuel injection pump M41; 3. Fuel quantity control valve Y94
Design
The B50 fuel temperature sensor is designed around a negative temperature coefficient resistor.
Functioning
The resistance of a resistor with a negative temperature coefficient of resistance is inversely proportional to temperature.
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