NHTSA Office of Defects Investigation
Engineering Analysis EA03-001: CNG TANK EXPLOSION
- Closed
NHTSA's Office of Defects Investigation opened Engineering Analysis EA03-001 on January 27, 2003 and closed it on November 19, 2003. NHTSA's investigations file lists the 1996–2003 Ford Crown Victoria for it and links recall 03V-472 to it.
Updated daily from NHTSA's investigations file
Key facts
- NHTSA number
- EA03-001 (also written EA03001)
- Investigation type
- Engineering Analysis A more detailed stage of a defect investigation, opened when NHTSA's Office of Defects Investigation decides an issue merits further review, often after a Preliminary Evaluation or a Recall Query; it can include vehicle testing, surveys and further information requests.
- Status
- Closed November 19, 2003
- Opened
- Closed
- Vehicle or equipment manufacturer
- Ford Motor Company
- Component
- Fuel System, Gasoline — Storage — Tank Assembly
- Recall linked by NHTSA
- 03V-472: FORD/NATURAL GAS FUEL TANK, reported
- Vehicles and equipment
- 1996–2003 Ford Crown Victoria
NHTSA's summary
As NHTSA's Office of Defects Investigation wrote it for Engineering Analysis EA03-001.
IN SEPTEMBER 2002, A FUEL CYLINDER IN A NATURAL GAS POWERED VEHICLE (NGV) EXPLODED DURING A FIRE.FORD AND VRTC TEST ENGINEERS JOINTLY EXAMINED THE INCIDENT VEHICLE AND REVIEWED TESTING TO DETERMINE WHETHER THE PERFORMANCE OF THE PRESSURE RELIEF VALVE (PRD) WAS PROPER.THE PURPOSE OF A PRD IS TO PROTECT A COMPRESSED NATURAL GAS TANK FROM OVERPRESSURE BY ALLOWING THE CNG TO VENT WHEN THE TEMPERATURE REACHES A SPECIFIC POINT.THE PRD WAS REMOVED FROM THE FAILED TANK AND SUBJECTED TO A YIELD TEMPERATURE DETERMINATION TEST. IT WAS CONCLUDED THAT A DIRECT FLAME (FROM THE INTERIOR OF THE VEHICLE) ONTO THE CYLINDER (LOCATED BEHIND THE REAR SEAT IN THE TRUNK)COMPROMISED THE HOOP STRENGTH OF THE NATURAL GAS CYLINDER, THUS ALLOWING THE CYLINDER TO FAIL PRIOR TO THE PRD RELEASING AT ITSDESIGNED TEMPERATURE.AS A RESULT OF THIS TESTING AND REVIEW OF THE INVOLVED VEHICLE, FORD HAS DEVELOPED AN INSULATOR TO INSULATE THE NATURAL GAS FUEL TANK FROM A LOCALLY DIRECTED FLAME PROJECTING FROM THE INTERIOR OF THE VEHICLE.INSULATORS WILL BE INSTALLED BEHIND THE BACK SEAT ON SUBJECT VEHICLES TO PREVENT FUTURE FAILURES OF THIS TYPE. FORD'S ACTION ADDRESSES THE CONCERNS OF ODI.THEREFORE, THIS INVESTIGATION IS CLOSED.
Vehicles and equipment listed for this investigation
NHTSA's investigations file lists these vehicles and equipment for Engineering Analysis EA03-001. A listed model year means only that an investigation names it; it says nothing about any particular vehicle. Model years with a try.vin recall page link to that page's NHTSA investigations section.
What an NHTSA investigation is
NHTSA's Office of Defects Investigation (ODI) looks into possible safety defects in vehicles and equipment, often after owner complaints. An investigation usually starts as a Preliminary Evaluation, or as a Recall Query when it concerns whether an existing recall covers the right vehicles or fixes the problem, and ODI can upgrade it to a more detailed Engineering Analysis. A Defect Petition asks NHTSA to open an investigation, and Audit and Equipment Queries are administrative investigations into whether companies complied with federal vehicle safety requirements, such as reporting, recall and certification rules.
An open investigation is not a finding that a safety defect exists, and NHTSA can close one without a recall.
To see whether a specific vehicle has an open recall, enter its VIN at nhtsa.gov/recalls.
Ford VIN check: decode a VIN to see its year, make and model.
Sources
NHTSA's investigation record for EA03-001
Investigation details come from NHTSA's investigations file, which try.vin imports once a day. The investigation types are described from the U.S. Department of Transportation Inspector General's May 2023 report on NHTSA's Office of Defects Investigation, NHTSA's petition rules (49 CFR Parts 552 and 557) and NHTSA's Office of Defects Investigation procedures. How try.vin reads NHTSA investigations.