NHTSA Office of Defects Investigation

Preliminary Evaluation PE08-063: CNG REGULATOR LEAK

Closed

NHTSA's Office of Defects Investigation opened Preliminary Evaluation PE08-063 on October 31, 2008 and closed it on February 27, 2009. NHTSA's investigations file lists the 2003–2004 Ford F-150 for it.

Updated daily from NHTSA's investigations file

Key facts

NHTSA number: PE08-063 (also written PE08063)
Investigation type: Preliminary Evaluation The first stage of most defect investigations: NHTSA's Office of Defects Investigation gathers basic information about a possible safety defect, including from the manufacturer.
Status: Closed February 27, 2009
Opened: October 31, 2008
Closed: February 27, 2009
Vehicle or equipment manufacturer: Ford Motor Company
Components: Fuel System, Other; Fuel System, Other — Delivery; Fuel System, Other — Delivery — Hoses, Lines/Piping, and Fittings; Fuel System, Other — Fuel Injection System
Vehicles and equipment: 2003–2004 Ford F-150

A recall appears here only when NHTSA's investigations file links one to the investigation; NHTSA's summary or record can name others.

NHTSA's summary

As NHTSA's Office of Defects Investigation wrote it for Preliminary Evaluation PE08-063.

THE AGENCY HAS CLOSED THIS INVESTIGATION BASED ON ITS REVIEW OF COMPLAINT REPORTS, DISCUSSIONS WITH COMPLAINANTS AND FIELD AND TECHNICAL DATA PROVIDED BY FORD.THE SUBJECT VEHICLES ARE 1/2 TON PICKUP TRUCKS AND ARE NATURAL GAS VEHICLES (NGV) THAT ARE FUELED BY GASOLINE OR COMPRESSED NATURAL GAS.THE AGENCY HAS RECEIVED REPORTS ALLEGING IMPROPER OPERATION OF THE NATURAL GAS FUEL PRESSURE REGULATOR ALLOWING RELEASE OF EXCESS AMOUNTS OF NATURAL GAS INTO THE ENGINE COMPARTMENT.FORD REPORTS THAT THE REGULATOR CONTAINS AN OVER PRESSURE RELIEF VALVE THAT WILL VENT NATURAL GAS SHOULD THE PRESSURE EXCEED A SET THRESHOLD.THE COMPLAINT REPORTS AND DATA REVIEWED BY THE AGENCY INDICATE THAT AN IMPROPERLY OPERATING PRESSURE REGULATOR CAN RESULT IN AN OVERPRESSURE CONDITION AND ACTIVATE THE REGULATOR PRESSURE RELIEF VALVE.THE RELEASED NATURAL GAS IS DIRECTED THROUGH A VENT HOSE THAT DISCHARGES THE NATURAL GAS IN THE VICINITY OF THE RIGHT FRONT WHEEL HOUSE AND AWAY FROM THE ENGINE COMPARTMENT'S EXTREMELY HOT AREAS/SURFACES.OWNERS ARE NORMALLY AWARE OF THIS PROBLEM BY THE PRESENCE OF AN ILLUMINATED WARNING LIGHT INSIDE THE VEHICLE, ODOR OF NATURAL GAS OR THE SOUND OF VENTING GAS.WHEN THE OPERATOR TURNS THE ENGINE OFF, THE NATURAL GAS SUPPLY TANK SOLENOID WILL CLOSE AND THE REGULATOR WILL NOT RELEASE NATURAL GAS.AT VEHICLE RESTART, THE SOLENOID VALVE WILL REMAIN CLOSED TO PREVENT LEAKAGE AND THE VEHICLE WILL ONLY OPERATE IN THE GASOLINE MODE.A SAFETY-RELATED DEFECT HAS NOT BEEN IDENTIFIED AT THIS TIME AND FURTHER USE OF AGENCY RESOURCES DOES NOT APPEAR TO BE WARRANTED.ACCORDINGLY, THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST.THE AGENCY WILL MONITOR THIS ISSUE AND RESERVES THE RIGHT TO TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.

Vehicles and equipment listed for this investigation

NHTSA's investigations file lists these vehicles and equipment for Preliminary Evaluation PE08-063. 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.

Ford

Ford F-150
- 2003, 2004

All Ford recalls

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 PE08-063

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.