U.S. opens investigation into fuel pump failures in more than 600,000 diesel Ram trucks

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US safety regulators are investigating fuel pump failures in more than 600,000 diesel Ram trucks that could cause engines to stall or lose power.

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The tests include Ram 2500, 3500, 4500 and 5500 heavy-duty trucks with 6.7-litre Cummins turbodiesel engines.

The National Highway Traffic Safety Administration said in documents posted on its website on Monday that it had received 22 complaints and two field reports of the engine stalling due to failing high-pressure fuel pumps. Agency documents say it has no reports of accidents or injuries.

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The agency says a review of complaints found that engines stalled above 25 mph, causing the trucks to stall.

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It said that in November of 2019, Fiat Chrysler (now Stelantis), the manufacturer of the trucks, issued a warranty bulletin to dealers asking them to assemble fuel pumps on the trucks.

The agency says it is launching an investigation to find out how often the problem occurs, what models are involved and whether there are any security flaws. Inquiry may lead to recall.

Stelantis said in a statement Monday that it was cooperating with the investigation.

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