FCA is recalling around 50,000 2018 Jeep Cherokees with the 2.4-liter engine because a fuel tube might leak and cause a fire. Only around 1% of the recalled Cherokees have the flaw, according to the company’s NHTSA filing; the vast majority were sold in the United States, and most of the rest were sold in Canada, though the recall is global in scope.

The only vehicles affected were built from September 1, 2017, to January 4, 2018, when the supplier switched to a new urethane-nesting block. Cherokees with the V6 engine have different fuel tubes.

The investigation started back in February, after fires had taken place. Engineers checked out the routing of the tube and ignition sources around it, and then visited Copper Standard, the supplier. Over time, they were able to discover the root cause of the problem, along with the date range for the flaw, from maintenance and scrap data.

There are no known accidents or injuries caused by the problem, which, again, affects a very small proportion of the Cherokees made with 2.4 liter engines. Dealers will, at no cost to customers, inspect their fuel supply tube and, if needed, replace it with a new part, number 68155177AC. The Federal filing claims that dealers and owners won’t be contacted until June 20, but dealers have apparently already been given details and parts are available.