Fuel Readings and Fuel Consumption Data Not Matching

Fuel readings and fuel consumption figures may appear inconsistent when the device is not sending regular or stable fuel and ignition data.

If the device sends data irregularly while the ignition is OFF, or the ignition status itself is unstable, the platform may not have consistent data for calculating fuel consumption and detecting fuel changes. This can result in differences between the fuel level shown at different times and the figures displayed in fuel reports.

Example Questions

• • Why is the fuel level different from the previous day's reading?
  • Why does the Fuel Economy Report show different consumption figures when checked again?
  • Why is the starting fuel value changing?
  • Why is fuel consumption not matching the actual fuel level?
  • Why are false fuel events being generated?
  • Why are fuel calculations inconsistent for the same vehicle?

Symptoms / How to Identify

• Fuel level changes unexpectedly between consecutive days.
• Fuel consumption figures differ when the report is generated or checked again.
• Data is not received at regular intervals when the vehicle ignition is OFF.
• Ignition status is unstable or inconsistent.
• Fuel calculations may be affected by irregular device data.
• False fill/drain events may be generated, particularly when the vehicle is moving.

Information Required Before Troubleshooting

• Vehicle/Object name.
• Device/IMEI details.
• Date and time of the reported discrepancy.
• Fuel Economy or relevant fuel report.
• Fuel graph/data for the affected period.
• Device raw data, including ignition and fuel values.
• Current fuel calibration settings.
• Fill/Drain Difference and speed threshold settings.
• Data Filtration Level.

Troubleshooting Steps

1. Check the raw data received from the device for the affected period.
2. Verify whether fuel data is being received consistently when the ignition is OFF.
3. Check the ignition data and confirm whether the ignition status is stable.
4. Review the fuel calibration settings.
5. Verify the Fill-Drain Difference to ensure minor fluctuations are not being treated as actual fuel events.
6. Check the Fill-Drain Speed Threshold to reduce false fuel events while the vehicle is moving.
7. Review the Data Filtration Level and confirm whether calculations should be based on raw or filtered data.
8. Recalculate/download the fuel report after the calibration changes.
9. Compare the updated report with the fuel graph and raw device data.
10. If irregular or unstable data continues to be received, the device/ignition configuration should be investigated at the hardware level.

Possible Cause

• Irregular fuel data received from the device.
• Data is not received consistently when ignition is OFF.
• Unstable ignition data affecting fuel monitoring and calculations.
• Small fuel fluctuations being identified as fill/drain events.
• False fuel events being generated while the vehicle is moving.
• Fuel calibration or filtration settings not appropriately configured for the received data.

Resolution / Action

Review both the device data quality and fuel calibration configuration.

Where required, adjust the calibration by:

• Increasing the Fill-Drain Difference to reduce false fuel events.
• Configuring the Fill-Drain Speed Threshold to avoid false events while the vehicle is moving.
• Setting the appropriate Data Filtration Level based on the quality of the received fuel data.

After making the changes, download the fuel report again and compare the results with the fuel graph and raw data.

If the ignition or fuel data continues to be irregular, the issue should be checked at the device/hardware level, as inconsistent data received from the device can directly affect fuel monitoring and calculations.