Motorcycle low fuel thermistor

[MarginallyStable]

My low fuel level indicator stopped working, and searching online seems to be a common issue. It uses a thermistor submerged/un-submerged depending on fuel level, and relies on self heating.

I have not verified on my bike yet, but it has been claimed that the self heating current is sourced from 12V through a 116ohm series resistance, and a thermistor resistance of <160 ohms is required to set the low fuel alert.

The recommend thermistor is 2K@25degC, B=3468K. My calculations say that this will have to get to 100degC to trip the alert.

Now the question, is this a reasonable temperature to have inside the (almost empty) gas tank?
Anyone have a better thermistor recommendation for this application?

[floobydust]

What package is the thermistor in, i.e. epoxy drop or glass DO-41? How does it get cooled by the gasoline, in a plastic thermowell?
There are two issues to confirm, one is the available fault current that the 116ohm resistor limits ~120mA is fine, and two the thermistor open air temperature well below any flash point.
The low fuel lamp threshold is important to know.

[MarginallyStable]

Did some measurement last night:
 -Open circuit voltage: 10.5v
 -Closed circuit current: 78ma
 -Light trips at about 170ohms

Original is mounted in a metal capsule, with holes allowing the gas direct contact to cool.
The recommended is a hermetically sealed glass thermistor, plan to attempt to non-destructively replace back into the original capsule.

[MarginallyStable]

One other thing to mention, took several R/V measurements. And they are defiantly non-linear, so the assumption that is a simple series resistance is incorrect.

[floobydust]

10.5V open-circuit is kind of a dead battery? At 78mA that's around 135 ohm pullup in the module perhaps.
At 170 ohms to activate, MF58 DO-41 glass 1kΩ@25°C B=3958 would be at 71°C. I find 1kΩ ref. thermistors are more popular.
2kΩ@25°C B=3468 would be at 105°C, seems pretty hot.