Fuel tank temperature level compensation

Yeah, if it’s an interesting issue.

The temperature sensor is also in the other end of the garage from the generator. (that causes the temperature rise when running)

Meanwhile the diesel tank is 2m from the generator. So if temp rises 5 degrees it is more likely 15 degrees around the generator.

The tank is an dubble isolated plastic tank, with an open “hole”. So no one way vale ore anything like that.

But it is quite extreme sometimes. From 1650 to 1250. 25%. That can’t be explained with any temperature effekt on plastic?

Se attached, I can’t understand that extreme difference. And the sensor measures preshure difference, so the general weather pressure shall not have any difference.

Can the sensor be broken?