No, the point is that an exact volume of fuel at 40 degrees F will show the same exact volume if pumped at 90 degrees F. Pump accuracy is not the issue.
BUT, there will be fewer molecules in that volume at the higher temperature.
So, if you put 10,000 gallons in a storage tank at 40 degrees F and pump it out at 90 degrees F, you will still have those "molecules" left in the storage tank.
https://www.onsitepoweradvisor.com/2012/12/03/thermal-expansion/The coefficient of expansion for diesel fuel is 0.00046 per degree Fahrenheit, or roughly 1% per every 20°F increase in temperature.The coefficient of expansion for diesel fuel is 0.00046 per degree Fahrenheit, or roughly 1% per every 20°F increase in temperature.