GMC Yukon stalled on highway with unusual sounds, shop replaced fuel pump but still won't start on GMC Yukon

Some GMC Yukon owners report experiencing stalling on the highway accompanied by unusual sounds, followed by failure to start even after replacing the fuel pump. These issues may stem from bad gas or water in the gas tank, which can prevent the engine from firing properly. Additionally, an erroneous signal from the MAF sensor can trigger the check engine light and complicate starting. Owners of GMC Yukons equipped with AFM or DFM may also face hydraulic lifter problems that affect engine performance. Furthermore, electrical issues, such as voltage problems leading to the fuel pump relay, can hinder the engine from cranking. Timing or ignition problems, including vacuum leaks at the intake manifold, may also contribute to stalling and starting difficulties. A thorough diagnosis by a qualified mechanic or dealership service center is crucial to effectively identify and resolve these complex issues.