Hyundai customers who brought their vehicles into the dealer for inspection under a recall in 2020 may need to return because the precautionary measure taken by the company at the time might not have been sufficient.

The company started a new recall on May 6 that related to the measures taken in 2020’s National Highway Traffic Safety Administration recall number 20V-121. That action was precipitated by a low-pressure fuel pump that feeds gas to the direct injection fuel pump. Over time, it was found that model year 2013-2014 Sonatas could develop a crack in the feed line, which could lead to a fuel leak and, potentially, a fire in the engine compartment.

As part of that recall, Hyundai inspected 206,896 vehicles throughout the U.S. to replace any cracked or leaking low-pressure fuel tubes. In vehicles that were not cracked or leaking, meanwhile, technicians installed high-temperature tape in an attempt to prevent them from failing, NHTSA documents reveal.

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This, however, has been found not to have been an effective means of preventing leaks. Since implementing the first recall, a small number of vehicles have been found to leak fuel anyway. For all the same reasons that that was bad before (i.e. engine compartment fires), Hyundai must now begin another recall, this time of 215,171 Sonatas.

As part of his recall, Hyundai will simply replace the fuel feed line at no cost to owners. The company plans to start notifying Sonata owners by first-class mail starting on July 5. It will also provide reimbursement for any customers who had to pay to replace the lines out of their own pockets.