Fuel heating system utilizing a liquid level responsive thermistor selector

摘要

A heater systen for a diesel fuel tank to minimize jelling of the fuel during operation at low wintertime temperatures includes an immersion heater that is selectively controlled by two temperature sensors (thermistors) positioned at different levels in the fuel tank. A liquid level responsive means operates a selector switch to alternately connect the two sensors to the heater as a response to changes in liquid level.