Fuel filter hoses can leak on 2,592 Freightliner trucks and 177 Tiffin motorhomes

Two federal safety recalls filed in the first days of October cover 2,592 Freightliner and FCCC trucks and 177 Tiffin Allegro Bus and Phaeton motorhomes, all for the same flaw. A pressurized fuel filter hose can pull loose from its fitting, spill diesel, and starve the engine, and the leak could meet an ignition source. Owner letters are scheduled to be mailed on November 20, 2026.

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Neither campaign carries a do-not-drive instruction, and neither vehicle type is flagged for fire risk while parked. The fix is a free hose replacement performed by Cummins, the engine maker, which means the work does not depend on the chassis builder or motorhome brand that sold the vehicle. NHTSA’s fields mark both campaigns as vehicle recalls with no fire risk while parked and no do-not-drive order, although the parent filing from Cummins lists a consumer advisory of “Do Not Drive Park Outside” for engines showing a leak.

Cummins L9 hose recall behind both campaigns

Both campaigns trace back to a parent filing by the engine supplier. In NHTSA equipment recall 26E066, submitted on September 28, 2026, Cummins reported that hoses on the remote Stage 2 fuel filter kit for its L9 diesel can separate from the fuel fitting, and it named possibly insufficient crimping of the hose connector as the cause. The company counted 39,052 engines as potentially involved, built from December 7, 2020 to April 10, 2026, and estimated that about 3 percent have the defect.

Those engines went into transit buses, trucks, recreational vehicles and fire trucks, and the filing lists buyers including New Flyer, Gillig, Nova Bus, Autocar, Daimler Trucks North America and PACCAR. The 2,592 trucks and 177 motorhomes are therefore the slice of the L9 population reaching owners through two vehicle makers.

Freightliner and FCCC trucks in campaign 26V660000

Daimler Trucks North America reported its campaign to NHTSA on October 7, 2026, and the agency’s recall dataset lists 2,592 potentially affected vehicles under the subject line “Fuel Filter Hoses May Disconnect and Leak Fuel.” The affected trucks carry the Cummins L9 and run across model years 2022 to 2027: Freightliner Business Class M2 (2022 to 2025), FCCC XCM and XCR (2022 to 2027), the 2023 Freightliner 108SD, and FCCC XCS and XBS (2024 to 2027).

NHTSA’s listing for 26V660000 is the page owners can search by campaign number. DTNA tracks the same action internally as F1042 and takes calls at 1-800-547-0712, while Cummins handles hose questions at 1-800-286-6467. The campaign is filed as a vehicle recall, and the owner letter date matches the November 20, 2026 mailing in the Cummins filing, so owners of both the trucks and the motorhomes will hear on the same day instead of in sequence.

Tiffin Allegro Bus and Phaeton motorhomes in campaign 26V662000

Tiffin Motorhomes, Inc. reported its recall one day later, on October 8, 2026, covering 177 Allegro Bus and Phaeton motorhomes from model years 2022 to 2025. The same dataset names the engine as an L9 with a specific part number, D563027BX03, and records the identical subject line about hoses that may disconnect and leak fuel. Tiffin’s internal number is TIF-150, and the company’s recall line is 1-256-356-8661. The agency’s 26V662000 record is where motorhome owners can confirm a VIN match once it is indexed.

For a motorhome, the stall scenario carries extra weight because a coach is often driven loaded, towing and carrying passengers. NHTSA’s description in both campaigns warns that a fuel leak in the presence of an ignition source increases the risk of a fire, and that an engine stall increases the risk of a crash.

This is not the first time the same hardware has been recalled on these motorhomes. In July 2021 Tiffin filed NHTSA recall 21V-545 for 330 model-year 2021 and 2022 Allegro Bus and Phaeton coaches, after Cummins told the builder about a related engine recall. That filing blamed inadequate design and quality of the fuel hose assembly between the fuel pump and the remote filter head, and described a redesigned hose that Cummins began building into engines on June 15, 2021.

A trade report at the time, published by RV Travel, described the same leak location and the same free replacement, with owner letters planned for early September 2021. The 2026 campaigns involve a different hose population and a newer crimp change: according to the Cummins filing, new production switched to an updated hose-to-fitting crimp on April 11, 2026.

Remedy and owner letters

NHTSA’s record says Cummins will replace the fuel hoses at no charge for the trucks, and that Cummins dealers will do so for the Tiffin motorhomes. The Cummins filing specifies redesigned hose parts numbered 6552994, 6553001 and 6553018, and it describes the effort as a phased recall, so some owners may hear later than others. It also lists the warning signs: a visible or noticeable fuel leak, or a malfunction indicator lamp showing the low fuel pressure code FC559.

Any Freightliner, FCCC or Tiffin owner who sees fuel under the vehicle or that code before November 20 can contact a Cummins dealer or the manufacturer lines above rather than wait for the letter. Because the mailing is scheduled for a date weeks away, the practical step is to look up the VIN on NHTSA’s recall search now and keep the campaign number handy. Fleet operators with several L9-powered trucks have the most to gain from checking early, since a single stall on a highway shoulder costs a day of work and a leak near a hot exhaust is the scenario NHTSA describes as a fire risk.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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