> For the complete documentation index, see [llms.txt](https://frinn.gitbook.io/custom-machinery-1.21/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://frinn.gitbook.io/custom-machinery-1.21/creating-custom-machines/machine-components/item-component/fuel.md).

# Fuel

The item component variant that burn items.

Use this item component variant to make the slot a fuel slot.

A fuel slot will burn the items inside it to process recipes that have a [Fuel requirement](/custom-machinery-1.21/recipes/requirements/fuel.md).

{% hint style="warning" %}
The ["mode"](/custom-machinery-1.21/creating-custom-machines/machine-components/item-component.md#name-mode) property of an item component with fuel variant must be `"input"` or `"both"` to let the player place fuel items inside the slot.
{% endhint %}

### ID

```json
"type": "custommachinery:item_fuel"
```

### Accepted items

Any item that have a burn time (like wood and coal) and match the filter defined in the item component "whitelist" and "blacklist" properties.

### Example

A simple fuel slot : 

```json
{
    "type": "custommachinery:item_fuel",
    "id": "fuel",
    "mode": "input"
}
```