One Cummins fuel hose has now triggered recalls on fire trucks, motorhomes and yard tractors alike

One part, a remote fuel filter hose on the Cummins L9 diesel, is now behind six separate NHTSA recalls: fire trucks, Class A motorhomes, a motorhome chassis, a touring coach, medium-duty trucks and a yard-haul truck. Five of the six campaigns state a unit count and add up to 4,891 vehicles; the sixth, covering Temsa coaches, has none on file.

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The part carries the number D563027BX03, and every filing describes the same fault in almost the same words.

One hose, one fault in six filings

The defect text is nearly identical from campaign to campaign. In the Daimler Trucks North America filing, NHTSA campaign 26V660000, the company writes: “The remote fuel filter hoses may separate from the fitting, causing a fuel leak and an engine stall.” The consequence is stated twice, as a fire risk if fuel leaks near an ignition source and a crash risk if the engine dies in traffic. The remedy is the same too: Cummins, or Cummins dealers, replace the hoses free of charge, and Cummins uses a single recall number, C7311, that shows up in the Sutphen, Shyft and Autocar records.

Because the supplier of the engine is the common thread, each vehicle maker files its own campaign instead of sharing one. That is why six numbers, spread over two weeks of reports, describe a single physical hose. NHTSA received them on Oct. 7, 8, 8, 12, 15 and 21, in the order Daimler, Sutphen, Tiffin, Temsa, Shyft and Autocar.

The six campaigns, vehicle by vehicle

Daimler’s 26V660000 is the largest with a stated count of 2,592 vehicles. It covers the Freightliner Business Class M2 from 2022 to 2025, the Freightliner 108SD from 2023, and FCCC chassis in the XCM and XCR lines from 2022 to 2027 and the XCS and XBS from 2024 to 2027. Daimler expects to mail owner letters on Nov. 20, 2026, and its own recall number is F1042. Autocar’s 26V699000 follows with 1,339 ACX, or Xpeditor, trucks from model years 2022 to 2027, the yard-haul vehicles in the group; letters are expected on Dec. 17, and Autocar’s campaign number is ACX-2603. Notably, NHTSA files Autocar’s component under engine cooling, while most of the other filings sit under diesel fuel delivery.

Sutphen’s 26V661000 is the fire-truck campaign: 410 fire trucks from model year 2021, with letters expected on Dec. 7, 2026. Shyft Group’s 26V679000 covers 373 Spartan RV Chassis K2 units from 2024 to 2027, with letters expected on Nov. 20 and Shyft’s own number, 26-07. Tiffin Motorhomes’ 26V662000, listed in the NHTSA dataset, covers 177 Allegro Bus and Phaeton motorhomes from model years 2022 to 2025 and carries the campaign number TIF-150, with letters on Nov. 20.

The last campaign has the thinnest record. Temsa’s 26V669000 covers 2024 and 2025 TS35 coaches, with letters expected on Nov. 19, 2026, and the dataset shows no unit count; the API says only “certain” coaches. The total of 4,891 therefore excludes the Temsa coaches and should be read as a floor.

Cummins does the work, and the letters arrive over four weeks

In all six campaigns the repair is the same swap: new fuel hoses, free of charge, done by Cummins or by Cummins dealers. Daimler’s remedy text reads, “Cummins will replace the fuel hoses, free of charge,” and lists two phone numbers, 1-800-547-0712 for the truck maker and 1-800-286-6467 for Cummins. That Cummins number repeats in the Sutphen, Temsa, Shyft and Autocar records, so a fire department, a motorhome owner and a coach operator are all pointed at one customer-service line for the part and at their own maker for the paperwork.

The owner letters are staggered. Temsa’s are expected on Nov. 19, 2026, Daimler’s, Tiffin’s and Shyft’s on Nov. 20, Sutphen’s on Dec. 7 and Autocar’s on Dec. 17, a spread of four weeks across the six. By the stated counts, Daimler’s 2,592 vehicles are 53 percent of the 4,891 on file, Autocar’s 1,339 are 27 percent, Sutphen’s 410 are 8 percent, Shyft’s 373 are 8 percent and Tiffin’s 177 are 4 percent.

How the set was found, and what it leaves out

The records were assembled from NHTSA’s data over several windows. Daimler’s report, received Oct. 7, sits in the dataset window for reports received Sept. 29 to Oct. 7, the four filings from Oct. 8 to Oct. 15 followed, and Autocar’s arrived last, in the dataset window beginning Oct. 21. The count of six is therefore the number visible in the windows checked, not a claim that no other maker bought the same engine; a manufacturer that used the L9 and has not yet filed would not appear in these records at all.

The NHTSA summaries read for this article do not say how the hose failure was first found, how many hoses have actually separated in service, or whether any fire or crash has been reported. They describe a risk, not an event, and they describe it identically across vehicles that have little else in common: a 2021 Sutphen fire truck, a 2024 Spartan motorhome chassis, a 2022 Freightliner Business Class M2 and a 2025 Autocar yard truck.

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

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