# Fuel<no value>

{{< callout context="caution" title="IMPORTANT!" icon="outline/alert-triangle" >}}

Token Variables - along with the [Gauge API](../gauge-api/) - have been deprecated in Microsoft Flight Simulator 2024 in favour of the new [Vars API](../../vars-api/vars-api/) and [Event API](../../event-api/event-api/), which work with the more extensive and supported [Simulation Variables](../../../simvars/simulation-variables/) and [Key Events](../../../key-events/key-events/).

{{< /callout >}}

This page lists the available **fuel** [Token Variables](token-variables/) for use when creating gauges using {{< glossterm >}}wasm{{< /glossterm >}} / C++.

 

 

### Fuel Tanks

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| Parameters                                                                      | Universal Var Member | Description                                                                                                               |
|---------------------------------------------------------------------------------|----------------------|---------------------------------------------------------------------------------------------------------------------------|
| `FUEL_TANK_LEFT_AUX_CAPACITY`     | `n` (FLOAT64)        | The maximum capacity of the Left Auxiliary fuel tank, in {{< glossterm >}}gallons{{< /glossterm >}}.                       |
| `FUEL_TANK_LEFT_AUX_LEVEL`           | `n` (FLOAT64)        | The fuel left in the Left Auxiliary tank expressed as a value between 0 and 8388608, corresponding to 0 to 100 percent.   |
| `FUEL_TANK_CENTER_CAPACITY`         | `n` (FLOAT64)        | The maximum capacity of the Center (1) fuel tank, in {{< glossterm >}}gallons{{< /glossterm >}}.                           |
| `FUEL_TANK_CENTER_LEVEL`               | `n` (FLOAT64)        | The fuel left in the Center (1) tank expressed as a value between 0 and 8388608, corresponding to 0 to 100 percent.       |
| `FUEL_TANK_CENTER2_CAPACITY`       | `n` (FLOAT64)        | The maximum capacity of the Center (2) fuel tank, in {{< glossterm >}}gallons{{< /glossterm >}}.                           |
| `FUEL_TANK_CENTER2_LEVEL`             | `n` (FLOAT64)        | The fuel left in the Center (2) tank expressed as a value between 0 and 8388608, corresponding to 0 to 100 percent.       |
| `FUEL_TANK_LEFT_MAIN_CAPACITY`   | `n` (FLOAT64)        | The maximum capacity of the Left Main fuel tank, in {{< glossterm >}}gallons{{< /glossterm >}}.                            |
| `FUEL_TANK_LEFT_MAIN_LEVEL`         | `n` (FLOAT64)        | The fuel left in the Left Main tank expressed as a value between 0 and 8388608, corresponding to 0 to 100 percent.        |
| `FUEL_TANK_LEFT_TIP_CAPACITY`     | `n` (FLOAT64)        | The maximum capacity of the Left Tip fuel tank, in {{< glossterm >}}gallons{{< /glossterm >}}.                             |
| `FUEL_TANK_LEFT_TIP_LEVEL`           | `n` (FLOAT64)        | The fuel left in the Left Tip tank expressed as a value between 0 and 8388608, corresponding to 0 to 100 percent.         |
| `FUEL_TANK_RIGHT_AUX_CAPACITY`   | `n` (FLOAT64)        | The maximum capacity of the Right Auxilliary fuel tank, in {{< glossterm >}}gallons{{< /glossterm >}}.                     |
| `FUEL_TANK_RIGHT_AUX_LEVEL`         | `n` (FLOAT64)        | The fuel left in the Right Auxilliary tank expressed as a value between 0 and 8388608, corresponding to 0 to 100 percent. |
| `FUEL_TANK_RIGHT_MAIN_CAPACITY` | `n` (FLOAT64)        | The maximum capacity of the Right Main fuel tank, in {{< glossterm >}}gallons{{< /glossterm >}}.                           |
| `FUEL_TANK_RIGHT_MAIN_LEVEL`       | `n` (FLOAT64)        | The fuel left in the Right Main tank expressed as a value between 0 and 8388608, corresponding to 0 to 100 percent.       |
| `FUEL_TANK_RIGHT_TIP_CAPACITY`   | `n` (FLOAT64)        | The maximum capacity of the Right Tip fuel tank, in {{< glossterm >}}gallons{{< /glossterm >}}.                            |
| `FUEL_TANK_RIGHT_TIP_LEVEL`         | `n` (FLOAT64)        | The fuel left in the Right Tip tank expressed as a value between 0 and 8388608, corresponding to 0 to 100 percent.        |

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### General Fuel

<table><thead><tr class="header"><th>Parameters</th><th>Universal Var Member</th><th>Description</th></tr></thead><tbody><tr class="odd"><td><code>FUEL_DUMP_ACTIVE</code></td><td><code>b</code> (BOOL)</td><td>Whether the fuel dump is active (TRUE, 1) or not (FALSE, 0).</td></tr><tr class="even"><td><code>FUEL_PUMP</code></td><td><code>b</code> (BOOL)</td><td>Whether the fuel pump is active (TRUE, 1) or not (FALSE, 0).</td></tr><tr class="odd"><td><code>FUEL_QUANTITY_CENTER</code>  

<code>FUEL_QUANTITY_CENTER2</code>  

<code>FUEL_QUANTITY_CENTER3</code></td><td><code>n</code> (FLOAT64)</td><td>The quantity of fuel in the Center 1/2/3 tank, in <a href="#" class="glossterm">Gallons</a>.</td></tr><tr class="even"><td><code>FUEL_QUANTITY_LEFT</code></td><td><code>n</code> (FLOAT64)</td><td>The quantity of fuel in the Left tank, in <a href="#" class="glossterm">Gallons</a>.</td></tr><tr class="odd"><td><code>FUEL_QUANTITY_RIGHT</code></td><td><code>n</code> (FLOAT64)</td><td>The quantity of fuel in the Right tank, in <a href="#" class="glossterm">Gallons</a>.</td></tr><tr class="even"><td><p><code>FUEL_TRANSFERT_PUMP_ON</code></p></td><td><code>b</code> (BOOL)</td><td>Whether the transfer pump is active (TRUE, 1) or not (FALSE, 0).</td></tr><tr class="odd"><td><code>FUEL_WEGHT_PER_GALLON</code></td><td><code>n</code> (FLOAT64)</td><td>Specifies weight of fuel, in pounds I.F. (6 lbs/gal = 1536)</td></tr><tr class="even"><td><code>SELECTED_FUEL_QUANTITY_GALLONS</code></td><td><code>n</code> (FLOAT64)</td><td>The fuel quantity for the selected tank, in <a href="#" class="glossterm">Gallons</a>.</td></tr><tr class="odd"><td><code>SELECTED_FUEL_QUANTITY_LITERS</code></td><td><code>n</code> (FLOAT64)</td><td>The fuel quantity for the selected tank, in Liters.</td></tr><tr class="even"><td><code>SELECTED_FUEL_QUANTITY_PERCENT</code></td><td><code>n</code> (FLOAT64)</td><td>The quantity of fuel in the tank expressed as a <a href="#" class="glossterm">Percent Over 100</a>.</td></tr><tr class="odd"><td><code>SELECTED_FUEL_TRANSFER_MODE</code></td><td><p><code>e</code> (ENUM)</p><ol><li>-1 = off</li><li>0 = auto</li><li>1 = forward</li><li>2 = aft</li></ol></td><td>The transfer mode for the selected fuel tank.</td></tr><tr class="even"><td><code>TOTAL_FUEL_QUANTITY_GALLONS</code></td><td><code>n</code> (FLOAT64)</td><td>The total fuel quantity available from all tanks, in <a href="#" class="glossterm">Gallons</a>.</td></tr><tr class="odd"><td><code>TOTAL_FUEL_QUANTITY_LBS</code></td><td><code>n</code> (FLOAT64)</td><td>The total fuel quantity available from all tanks, in <a href="#" class="glossterm">lbs</a>.</td></tr><tr class="even"><td><code>TOTAL_UNUSABLE_FUEL_QUANTITY_GALLONS</code></td><td><code>n</code> (FLOAT64)</td><td>The total fuel quantity that will not be useable from all tanks, in <a href="#" class="glossterm">Gallons</a>.</td></tr></tbody></table>

 

 

### Fuel System

The following fuel system token variables all require that the aircraft is using the [Fuel System](../../../../content-configuration/cfg-files/flight-model/modular-fuel-system-information/) parameters, not the legacy [\[FUEL\]](../../../../content-configuration/cfg-files/flight_model.cfg/#FUEL) parameters.

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| Parameters                                                                        | Universal Var Member | Description                                                                                                             |
|-----------------------------------------------------------------------------------|----------------------|-------------------------------------------------------------------------------------------------------------------------|
| `FUELSYSTEM_ENGINE_PRESSURE`         | `n` (FLOAT64)        | The pressure of the fuel coming to the engine, in kilopascal.                                                           |
| `FUELSYSTEM_JUNCTION_SETTING`       | `n` (FLOAT64)        | The fuel system junction setting.                                                                                       |
| `FUELSYSTEM_LINE_FUEL_FLOW`           | `n` (FLOAT64)        | The fuel flowing through the line, in {{< glossterm >}}gallons{{< /glossterm >}} per hour.                               |
| `FUELSYSTEM_LINE_FUEL_LEVEL`         | `n` (FLOAT64)        | The level of fuel in the line, in {{< glossterm >}}gallons{{< /glossterm >}}.                                            |
| `FUELSYSTEM_LINE_FUEL_PRESSURE`   | `n` (FLOAT64)        | The fuel pressure in the line, in kilopascals.                                                                          |
| `FUELSYSTEM_PUMP_ACTIVE`                 | `b` (BOOL)           | Whether the fuel system pump is active (TRUE, 1) or not (FALSE, 0).                                                     |
| `FUELSYSTEM_PUMP_SWITCH`                 | `b` (BOOL)           | Whether the fuel system pump is enabled (TRUE, 1) or not (FALSE, 0).                                                    |
| `FUELSYSTEM_TANK_CAPACITY`             | `n` (FLOAT64)        | The total capacity of the tank, in {{< glossterm >}}gallons{{< /glossterm >}}.                                           |
| `FUELSYSTEM_TANK_LEVEL`                   | `n` (FLOAT64)        | The quantity of fuel available for use in the tank, expressed as a {{< glossterm >}}percent_over_100{{< /glossterm >}}.  |
| `FUELSYSTEM_TANK_QUANTITY`             | `n` (FLOAT64)        | The quantity of fuel available for use in the tank, in {{< glossterm >}}gallons{{< /glossterm >}}.                       |
| `FUELSYSTEM_TANK_TOTAL_QUANTITY` | `n` (FLOAT64)        | The total quantity of fuel in the tank, including any that can't be used, in {{< glossterm >}}gallons{{< /glossterm >}}. |
| `FUELSYSTEM_TANK_WEIGHT`                 | `n` (FLOAT64)        | The weight of fuel in the fuel tank, in {{< glossterm >}}lbs{{< /glossterm >}}.                                          |
| `FUELSYSTEM_TRIGGER_STATUS`           | `b` (BOOL)           | Whether a trigger is active (TRUE, 1) or not (FALSE, 0).                                                                |
| `FUELSYSTEM_VALVE_OPEN`                   | `b` (BOOL)           | Whether the valve is open (TRUE, 1) or not (FALSE, 0).                                                                  |
| `FUELSYSTEM_VALVE_SWITCH`               | `n` (FLOAT64)        | Whether the valve is set to be opened (TRUE, 1) or not (FALSE, 0).                                                      |

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### Engine Fuel Systems

<table><thead><tr class="header"><th>Parameters</th><th>Universal Var Member</th><th>Description</th></tr></thead><tbody><tr class="odd"><td><code>ENGINE_1_FUELFLOW_BUG_POSITION</code>  

<code>ENGINE_2_FUELFLOW_BUG_POSITION</code>  

<code>ENGINE_3_FUELFLOW_BUG_POSITION</code>  

<code>ENGINE_4_FUELFLOW_BUG_POSITION</code></td><td><code>n</code> (FLOAT64)</td><td>The fuelflow bug position in <a href="#" class="glossterm">lbs</a> per hour for engine 1/2/3/4.</td></tr><tr class="even"><td><code>ENGINE1_FUEL_PUMP_ON</code>  

<code>ENGINE2_FUEL_PUMP_ON</code>  

<code>ENGINE3_FUEL_PUMP_ON</code>  

<code>ENGINE4_FUEL_PUMP_ON</code></td><td><code>n</code> (FLOAT64)</td><td>Whether the fuel pump for engine 1/2/3/4 is on (TRUE, 1) or off (FALSE, 0).</td></tr><tr class="odd"><td><code>GENERAL_ENGINE1_FUEL_PRESSURE</code>  

<code>GENERAL_ENGINE2_FUEL_PRESSURE</code>  

<code>GENERAL_ENGINE3_FUEL_PRESSURE</code>  

<code>GENERAL_ENGINE4_FUEL_PRESSURE</code></td><td><code>n</code> (FLOAT64)</td><td>The engine 1/2/3/4 fuel pressure, in <a href="#" class="glossterm">psf</a>.</td></tr><tr class="even"><td><code>GENERAL_ENGINE1_FUEL_VALVE</code>  

<code>GENERAL_ENGINE2_FUEL_VALVE</code>  

<code>GENERAL_ENGINE3_FUEL_VALVE</code>  

<code>GENERAL_ENGINE4_FUEL_VALVE</code></td><td><code>n</code> (FLOAT64)</td><td>The fuel valve state for engine 1/2/3/4, either open (TRUE, 1) or closed (FALSE, 0).</td></tr></tbody></table>