Today’s system to measure the volume in a tank consists of a vertically placed sensor. When a vehicle is tilted the level of the fluid might change and if the volume is calculated based only on the information from the sensor it could result in a incorrect value. This thesis exams a new method to calculate the volume in tanks by using sensor fusion to crosscheck the i formation from the level sensors when the vehicle is tilted. The information is then used to see if it is possible to identify the grade of tilt by the change of fluid level. If the grade of tilt can be measured then the volume can be calculated in a more accurate way. The accuracy of measuring the fluid level depends on the tolerance; tank volume, sensor measurement and montage for both tank and sensor. This limitation is also examined. To exam if the tilt can be measured a volume calculation program was created to calculate the volume in tank as a function of tilt and fluid level. Volume calculation was done for both nominal cases and cases with tolerances for the tank and sensor. When analyzing the change in fluid level from the data, the result was that the tilt can’t be determined in a sufficient reliable manner. The tilt combination causing the fluid level to change could be more than one. This means that there are too many non unique solutions to determine the tilt with 5 degree accuracy.