By Mike Spector And Christina Rogers 

A jury is set to hear Fiat Chrysler Automobiles NV Chief Executive Sergio Marchionne's testimony in a lawsuit over a 4-year-old boy killed in a Jeep that caught fire, renewing scrutiny of fuel tanks in older sport-utility vehicles that regulators tied to 51 deaths.

Lawyers representing a family suing Chrysler for the boy's wrongful death plan to play a video-taped deposition of Mr. Marchionne as soon as Wednesday or Thursday. Chrysler, the Jeep's manufacturer, is now called FCA US LLC.

The trial, which started on Tuesday in a Georgia courtroom, comes after a record number of U.S. vehicle recalls in 2014, and public probes into defective ignition switches at General Motors Co. and rupturing Takata Corp. air bags. The Jeep case could settle before jurors hear depositions of Mr. Marchionne and other Fiat Chrysler employees, though it isn't likely. Jurors viewed a brief part of Mr. Marchionne's testimony dealing with a vehicle safety standard on Tuesday during a lawyer's opening statement.

The company says the SUVs are safe and that it agreed to recall 1.56 million of them and inspect other Jeeps to assuage customer concerns, and not as an admission of wrongdoing. The company is currently installing trailer hitches on the backs of Jeeps designed to add protection in lower-speed collisions.

Fiat Chrysler so far has avoided the kind of recall scrutiny received by GM and Japan's Takata. Those companies have spent heavily on addressing their problems, and both have grappled with U.S. Justice Department probes, fines from regulators and hearings on Capitol Hill.

Regulators have raised concerns over the pace of Jeep repairs but stopped short of asking Chrysler to call them defective.

Mr. Marchionne's testimony is expected to throw into sharp relief Chrysler's tussles with federal regulators over millions of older Jeep models with fuel tanks installed behind the rear axle that the government found were vulnerable to igniting in rear-end crashes.

The auto maker initially resisted a National Highway Traffic Safety Administration request in June 2013 to recall 2.7 million Jeep Grand Cherokee and Liberty SUVs with model years ranging from 1993 to 2007. It took a meeting between Mr. Marchionne and two top auto-safety regulators for the auto maker to begin addressing the Jeeps.

The parents of the 4-year-old boy, Remi Walden, sued Chrysler after their 1999 Grand Cherokee burst into flames in a rear-end collision while stopped and waiting for traffic to clear in March 2012, according to court records. The vehicle is among those Jeeps the auto maker is inspecting as part of a "customer satisfaction campaign" in lieu of a recall. A Fiat Chrysler spokesman said the Jeep was rear-ended by a pickup truck in a "violent, high-energy crash caused by a negligent driver."

After a Chrysler official contacted then-NHTSA head David Strickland in early June 2013, a meeting was set between Messrs. Marchionne and Strickland and then-U.S. Transportation Secretary Ray LaHood, according to emails reviewed by The Wall Street Journal. "The meeting would only be with the Secretary and I, no other staff, as Sergio wanted," Mr. Strickland wrote in an email to Chrysler's Jody Trapasso on June 7, 2013.

A Fiat Chrysler spokesman said Mr. Marchionne only communicated he would attend the meeting alone. After meeting, both sides eventually agreed to the limited recall, service campaign and trailer-hitch repair.

Regulators agreed to the deal in part because they weren't certain they'd prevail if they ordered a recall Chrysler challenged in court, where the government's evidence a safety defect exists must outweigh the manufacturer's contrary evidence, said a person close to the matter.

The government's testing showed the Jeeps performed worse than other similar vehicles in low and moderate-speed collisions, this person said. The Jeeps could have remained unaddressed if regulators continued fighting the company, this person said.

A NHTSA spokesman said the agency continues to receive complaints from consumers about difficulties getting Jeeps repaired. A Fiat Chrysler spokesman said the company has engaged in more than 5 million additional mailings, emails, phone calls and Facebook Inc. ads to alert Jeep owners, and received about 61,000 responses as of the end of last week.

Write to Mike Spector at mike.spector@wsj.com and Christina Rogers at christina.rogers@wsj.com

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