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docs/en/msg_docs/FuelTankStatus.md
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---
pageClass: is-wide-page
---
# FuelTankStatus (UORB message)
**TOPICS:** fuel_tankstatus
## Fields
[source file](https://github.com/PX4/PX4-Autopilot/blob/main/msg/FuelTankStatus.msg)
| Name | Type | Unit [Frame] | Range/Enum | Description |
| --------------------- | --------- | ------------ | ---------- | ------------------------------------------------------------------------------------------------------------------------------- |
| timestamp | `uint64` | | | time since system start (microseconds) |
| maximum_fuel_capacity | `float32` | | | maximum fuel capacity. Must always be provided, either from the driver or a parameter |
| consumed_fuel | `float32` | | | consumed fuel, NaN if not measured. Should not be inferred from the max fuel capacity |
| fuel_consumption_rate | `float32` | | | fuel consumption rate, NaN if not measured |
| percent_remaining | `uint8` | | | percentage of remaining fuel, UINT8_MAX if not provided |
| remaining_fuel | `float32` | | | remaining fuel, NaN if not measured. Should not be inferred from the max fuel capacity |
| fuel_tank_id | `uint8` | | | identifier for the fuel tank. Must match ID of other messages for same fuel system. 0 by default when only a single tank exists |
| fuel_type | `uint32` | | | type of fuel based on MAV_FUEL_TYPE enum. Set to MAV_FUEL_TYPE_UNKNOWN if unknown or it does not fit the provided types |
| temperature | `float32` | | | fuel temperature in Kelvin, NaN if not measured |
## Constants
| Name | Type | Value | Description |
| ----------------------------------------------------------- | ------- | ----- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- |
| <a href="#MAV_FUEL_TYPE_UNKNOWN"></a> MAV_FUEL_TYPE_UNKNOWN | `uint8` | 0 | fuel type not specified. Fuel levels are normalized (i.e., maximum is 1, and other levels are relative to 1). |
| <a href="#MAV_FUEL_TYPE_LIQUID"></a> MAV_FUEL_TYPE_LIQUID | `uint8` | 1 | represents generic liquid fuels, such as gasoline or diesel. Fuel levels are measured in millilitres (ml), and flow rates in millilitres per second (ml/s). |
| <a href="#MAV_FUEL_TYPE_GAS"></a> MAV_FUEL_TYPE_GAS | `uint8` | 2 | represents a gas fuel, such as hydrogen, methane, or propane. Fuel levels are in kilo-Pascal (kPa), and flow rates are in milliliters per second (ml/s). |
## Source Message
[Source file (GitHub)](https://github.com/PX4/PX4-Autopilot/blob/main/msg/FuelTankStatus.msg)
::: details Click here to see original file
```c
uint64 timestamp # time since system start (microseconds)
@@ -22,5 +52,6 @@ uint8 MAV_FUEL_TYPE_LIQUID = 1 # represents generic liquid fuels, such as gasol
uint8 MAV_FUEL_TYPE_GAS = 2 # represents a gas fuel, such as hydrogen, methane, or propane. Fuel levels are in kilo-Pascal (kPa), and flow rates are in milliliters per second (ml/s).
float32 temperature # fuel temperature in Kelvin, NaN if not measured
```
:::