UN 3166 — Vehicle, fuel cell, flammable liquid powered
Placard: Miscellaneous. ERG Guide 128. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3166 is Vehicle, fuel cell, flammable liquid powered, a fuel-cell vehicle with flammable liquid fuel assigned to ERG Guide 128. Fuel breach and electrical hazards require control.
Hazard overview: Fuel cell vehicle powered by flammable liquid; fuel-system breach can release ignitable vapors. Alcohol or other liquid fuel vapors may travel to ignition sources and flash back. Vehicle electrical systems may remain energized and complicate stabilization or extrication.
Response guidance: For UN 3166, isolate the area, avoid exposure and use SCBA where vapor, gas, dust, smoke or fire is present. Verify exact contents with SDS, labels and ERG 128.
Firefighter training notes: Training for UN 3166 should emphasize product verification, SCBA use, exposure control, decontamination, runoff containment and SDS/shipping paper review. Use ERG 128, SDS and local SOP.
Regulatory context: Vehicle, fuel cell, flammable liquid powered is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on quantity, package type, formulation and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Vehicle, fuel cell, flammable liquid powered should be stored in tightly closed compatible containers or packages with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 3166 Quick Details
Common Hazards of UN 3166
- Fuel cell vehicle powered by flammable liquid; fuel-system breach can release ignitable vapors.
- Alcohol or other liquid fuel vapors may travel to ignition sources and flash back.
- Vehicle electrical systems may remain energized and complicate stabilization or extrication.
- Fuel may be water-miscible or may float depending on exact liquid; verify vehicle data and SDS.
- Fire may involve plastics, batteries, fuel-cell components and toxic smoke.
- Runoff may carry fuel, electrolyte or other vehicle contaminants.
- Do not assume hydrogen-only behavior; this entry is flammable liquid powered.
Chemical Identity & Physical Properties
Complete vehicle powered by a fuel cell system containing flammable liquid fuel (typically methanol or other liquid hydrogen carriers). The vehicle includes integrated fuel tanks, fuel cell stack, and associated electrical systems. Typically operates at ambient temperature with stored liquid fuel.
| Also known as | Fuel cell vehicleHydrogen fuel cell vehicleFuel cell powered vehicleAlternative fuel vehicleZero emission vehicle |
| Appearance | Complete vehicle powered by a fuel cell system containing flammable liquid fuel (typically methanol or other liquid hydrogen carriers). The vehicle includes integrated fuel tanks, fuel cell stack, and associated electrical systems. Typically operates at ambient temperature with stored liquid fuel. |
| Flash Point | Varies by fuel type: Methanol -11°C (12°F), Ethanol 13°C (55°F) |
| Boiling Point | Varies by fuel type: Methanol 65°C (149°F), Ethanol 78°C (172°F) |
| Vapor Density | Heavier than air (methanol 1.1, ethanol 1.6 relative to air) |
| Water Reactivity | No significant reaction with water; however, fuel leakage may create flammable vapor/air mixtures |
Fireground Response Guidance — UN 3166
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, dust, smoke, fire or confined-space exposure. Wear chemical-resistant gloves, eye/face protection and protective clothing.
Isolation & Evacuation
First Actions for a UN 3166 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream.
- Eliminate ignition sources if this can be done safely.
- Avoid breathing vapor, gas, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers, cylinders, articles or spilled material without proper training and PPE.
- Prevent contaminated runoff, debris and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 128, SDS, shipping papers, markings and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3166 — Vehicle, fuel cell, flammable liquid powUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.