> ## Documentation Index
> Fetch the complete documentation index at: https://www.narev.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Fuel: controls and readings

## Access through MCP

Use `list_groups` to discover cockpit groups. `list_readings` lists their readable values; `read_group` returns the current values. Available controls are listed below with their `cockpit_*` tool.

### APU and fuel

Read this group with `read_group`:

```json theme={null}
{
  "group": "apu-and-fuel"
}
```

#### Controls

Call `cockpit_apu_and_fuel` with `action` and, where indicated, `value` or `text`.

| Control | action | Input |
| - | - | - |
| APU | `apu` | select; 0=off, 1=on |
| Left forward fuel pump | `left-forward-fuel-pump` | select; 0=off, 1=on |
| Left aft fuel pump | `left-aft-fuel-pump` | select; 0=off, 1=on |
| Right forward fuel pump | `right-forward-fuel-pump` | select; 0=off, 1=on |
| Right aft fuel pump | `right-aft-fuel-pump` | select; 0=off, 1=on |
| Center left fuel pump | `center-left-fuel-pump` | select; 0=off, 1=on |
| Center right fuel pump | `center-right-fuel-pump` | select; 0=off, 1=on |
| Crossfeed | `crossfeed` | select; 0=off, 1=on |
| APU start | `apu-start` | press |

#### Readings

Call `read_reading` with `reading_id` from this table, or read all values with `read_group`.

| Reading | reading\_id | Unit |
| - | - | - |
| APU | `apu-and-fuel.apu` | — |
| Left forward fuel pump | `apu-and-fuel.left-forward-fuel-pump` | — |
| Left aft fuel pump | `apu-and-fuel.left-aft-fuel-pump` | — |
| Right forward fuel pump | `apu-and-fuel.right-forward-fuel-pump` | — |
| Right aft fuel pump | `apu-and-fuel.right-aft-fuel-pump` | — |
| Center left fuel pump | `apu-and-fuel.center-left-fuel-pump` | — |
| Center right fuel pump | `apu-and-fuel.center-right-fuel-pump` | — |
| Crossfeed | `apu-and-fuel.crossfeed` | — |
| APU fault | `apu-and-fuel.apu-fault` | — |
| APU low oil | `apu-and-fuel.apu-low-oil` | — |
| Low fuel pressure left 1 | `apu-and-fuel.low-fuel-pressure-left-1` | — |
| Low fuel pressure left 2 | `apu-and-fuel.low-fuel-pressure-left-2` | — |
| Low fuel pressure center 1 | `apu-and-fuel.low-fuel-pressure-center-1` | — |
| Low fuel pressure center 2 | `apu-and-fuel.low-fuel-pressure-center-2` | — |
| Low fuel pressure right 1 | `apu-and-fuel.low-fuel-pressure-right-1` | — |
| Low fuel pressure right 2 | `apu-and-fuel.low-fuel-pressure-right-2` | — |
| Crossfeed valve open | `apu-and-fuel.crossfeed-valve-open` | — |
| Fuel valve closed engine 1 | `apu-and-fuel.fuel-valve-closed-engine-1` | — |
| Fuel valve closed engine 2 | `apu-and-fuel.fuel-valve-closed-engine-2` | — |


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