DETROIT (AP) — U.S. National Highway Traffic Safety Administration said it has “significant safety concerns” about a Ford SUV recall repair that doesn’t fix gasoline leaks that can cause engine fires.

NHTSA is demanding volumes of information from the automaker as the agency investigates the repair in a March 8 recall of Bronco Sport SUVs from the 2022 and 2023 model years, and Escape SUVs from 2022.

Ford says the SUVs have fuel injectors that can crack, allowing gas or vapor to leak near hot engine parts and cause fire.

In an April 25 letter to Ford, released Thursday, the agency’s Office of Defects Investigation wrote that, based on review of the recall, it believes the remedy program does not address the root cause of the issue and does not proactively call for replacement of defective fuel injectors.

Ford’s remedy for the leaks is to add a drain tube to send the gas away from hot surfaces, and a software update to detect a pressure drop in the fuel injection system. 

But NHTSA wants Ford to provide detail of testing done to verify the remedy resolves the problem and whether hardware repair is necessary. 

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