The litigation involves Ford diesel trucks produced from 2011 to the present. Plaintiffs claim the CP4 pump is insufficiently robust for the American market, particularly when paired with ultra-low sulfur diesel fuel. According to the lawsuit, when the pump fails, it sends metal debris through the engine, causing sudden shutdowns that pose significant safety risks. Repair costs for these incidents range from $8,000 to $20,000, expenses that owners allege Ford frequently refuses to cover under warranty by citing fuel contamination.
Federal Judge Certifies Class Action Against Ford Over CP4 Fuel Pumps
A federal judge has cleared the way for Ford owners in five states to pursue a class-action lawsuit regarding alleged defects in the CP4 high-pressure fuel pump. U.S. District Judge Laurie J. Michelson rejected Ford’s attempt to dismiss the case, allowing claims to move forward for 6.7L diesel truck owners.
Ford had argued that individual variations in pump failure made a class action unworkable. However, the court ruled that the core question—whether the CP4 design is inherently defective for foreseeable fuel conditions—predominates over individual causation issues. The certification covers owners in California, Louisiana, Ohio, Pennsylvania, and South Carolina. Bob Hilliard, founder of Hilliard Law, characterized the decision as a milestone for customers seeking accountability for out-of-pocket repair costs. While the court has yet to determine if the pump is legally defective, the ruling in Droesser, et al. v. Ford Motor Co. brings the dispute significantly closer to a jury trial.




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