Hi,(adsbygoogle = window.adsbygoogle || []).push({});

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

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Fuel pressure change in closed fuel tank

**Physics Forums | Science Articles, Homework Help, Discussion**