Recall 14V591 affects 112 2014-2015 Thomas Built Buses Saf-T-Liner C2 buses for propane fuel-rail leaks. Free repair at authorized Thomas Built Buses service facilities.
Thomas Built Buses is recalling 112 2014-2015 Saf-T-Liner C2 school buses under recall 14V591 because propane fuel injectors in the fuel rails can be improperly secured and a fuel delivery tube can leak. A propane leak can stall the bus, and leaking propane near an ignition source increases fire risk; the dealer repair will be free once available.
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What's wrong?
The fuel rail on the 2014-2015 Thomas Built Buses Saf-T-Liner C2 is the part of the propane fuel system that feeds fuel to the engine injectors. On buses with LPI fuel rails for 6 and 8 liter engines, the rail and injector hardware keep propane moving through sealed tubes at the right pressure. The retainer clip is supposed to hold each injector and fuel delivery tube firmly in place.
On these buses, the propane fuel injectors in the fuel rail are not secured correctly by the retainer clip. When the clip does not hold the parts tightly, a fuel delivery tube can shift or fail to seal. That creates a propane leak at the fuel rail instead of keeping the fuel inside the delivery system.
There is no warning sign before failure. The issue is in the way the injector and tube are retained, so an owner or driver is not given a clear symptom before the tube leaks.
Who's affected?
The scope stays within the Saf-T-Liner C2 bus line, and both listed model years point to the same fuel system component.
| 2015 Thomas Built Buses Saf-T-Liner C2 | fuel system |
|---|---|
| 2014 Thomas Built Buses Saf-T-Liner C2 | fuel system |
| Units affected | 112 |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific bus is included.
What's the safety risk?
Either condition can allow propane to leak, which can stall the bus. Leaking propane near an ignition source also increases the risk of a fire. Treat any suspected propane leak or stall as a reason to stop using the bus and call for service. Repair will be free at any franchised Thomas Built Buses dealer once available.
What should I do?
- Check your VIN to confirm your 2014-2015 Thomas Built Buses Saf-T-Liner C2 is included in this recall.
- Contact a franchised Thomas Built Buses dealer or an authorized service facility about the free fuel-rail inspection.
- Ask the service desk to verify the injector retainer clip and replace any leaking fuel delivery tubes for the propane fuel system.
- Reference recall number 14V591 when you call Thomas Built Buses customer service at 1-800-547-0712.
- Avoid operating the bus if you smell propane, see a fuel leak, or notice stalling before the repair is complete.
What happens at the repair
At an authorized Thomas Built Buses or CleanFuel USA repair facility, the technician verifies that the injector retainer clip is installed correctly on the propane fuel rail. If a fuel delivery tube is leaking, the facility replaces it. The recall remedy states this work is free of charge. Because the final repair is not marked open in the recall details provided here, treat the dealer repair as free once available and confirm scheduling with the service facility.
Timeline
| September 23, 2014 | NHTSA published the recall |
|---|---|
| November 21, 2014 | Owner notification mailed |
Frequently asked questions
What is recall 14V591?
Recall 14V591 covers 112 2014-2015 Thomas Built Buses Saf-T-Liner C2 school buses with LPI fuel rails for 6 and 8 liter engines. Propane fuel injectors can be unsecured, and a fuel delivery tube can leak. The repair is free.
What should I do if my 2014-2015 Thomas Built Buses Saf-T-Liner C2 is on this recall?
Check your VIN to confirm your specific bus is included in recall 14V591. If it is, contact an authorized Thomas Built Buses service facility or CleanFuel USA authorized repair facility. Reference recall 14V591 and FL-667 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost. An authorized Thomas Built Buses service facility or CleanFuel USA authorized repair facility will verify the injector retainer clip installation and replace leaking fuel delivery tubes for free.
What is the safety risk?
The safety risk is a propane leak that can cause a stall. Leaking propane near an ignition source also increases fire risk. If your VIN is included, arrange the free fuel-rail inspection and repair through an authorized service facility.
When did the recall repair begin?
The recall repair began on November 21, 2014. Owners can contact Thomas Built Buses customer service at 1-800-547-0712 or call an authorized service facility with recall 14V591 and FL-667 to confirm the free repair path for a specific VIN.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/14V591000 |
|---|---|
| Thomas Built Buses customer service | 1-800-547-0712 |
| NHTSA recall # | 14V591 |
| NHTSA recall # (full) | 14V591000 |
Source documents
-
Download Misc. Document (PDF) - Download Recall Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Quarterly Report (PDF)
- Download Defect / Noncompliance Notice (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on June 1, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →