The National Highway Traffic Safety Administration's inquiry is looking at 2005-07 Buick Rainiers, 2005-07 Chevrolet Trailblazers 360s, 2005-06 Trailblazer EXT 370s, 2005-07 GMC Envoy 360s, 2005-06 GMC Envoy XL 370s and 2005-07 Saab 9-7Xs.
None of those SUVs models are still being sold as new any longer, but, of course, they are still actively sold on the used car market.
NHTSA said it has received 668 complaints of inaccurate fuel-gauge readings, 58 of which involved stalling vehicles. A GM spokesman said the automaker is fully cooperating with the safety agency.
In 43 of the complaints, stalling resulted from a reading of more fuel in the vehicles than what was actually in the fuel tank. According to one complaint, the vehicle stalled out while exiting a highway, became disabled and was struck from behind.