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I am measuring pressure at the bottom of a fuel tank and temp variations are giving me a tough time. I wish to clear my head so here goes my reasoning as temp increases

- Tank Volume increases causing - height of fuel to decrease, pressure at the bottom of tank to decrease

- Fuel density decreases causing - volume of fuel to increase, height of fuel to increase, pressure at bottom of tank to increase

- Fuel vaporization increases causing - volume of fuel to decrease, height of fuel to decrease, pressure of fuel to decrease, however this leads to an increased pressure on the fuel, so since I am measuring relative to ambient pressure this should show an increase in pressure, right? The mathematics involved / equations are unknown to me, a few pointers here would be great!

- Any other effect?

What would the net effect of a temp rise be? Currently my data shows that as temp increases, pressure decreases.

Tank is 300ltrs, fuel is diesel.

Regards