Start with matched identification
Review safely accessible set and engine labels plus the applicable specification or service records. Keep the equipment identifiers with the evidence. Do not infer fuel type from enclosure color, brand familiarity or the presence of a tank elsewhere on the property.
Preserve precise descriptions
If records identify diesel, natural gas, propane or another fuel, copy the description accurately. Avoid shortening a specific gas-fuel description to gas when that obscures the source. If multiple fuels or configurations are mentioned, share the original context rather than assuming every listed option applies to the current unit.
Disclose conversion or modification records
If the equipment’s fuel arrangement changed, include the documented work and any later assessment. Distinguish a proposed conversion from a completed, verified configuration. Ask a qualified equipment specialist to resolve conflicting information; do not test an uncertain fuel arrangement to fill in the form.
Keep fuel contents separate from fuel type
The documented fuel type does not establish the quantity or condition of any fuel currently present. Describe those as separate known or unknown facts. State whether tanks and contents form part of the proposed sale and leave handling arrangements to qualified providers.