Nissan TITAN loss of power and poor fuel mileage with gas backflow during filling and electrical issues on Nissan TITAN

Some Nissan Titan owners report experiencing a loss of power and poor fuel mileage, particularly in the 2016 – 2019 models equipped with the 5.0L Cummins engine, which is known for issues like going into limp mode and problems with the fuel pump, EGR cooler, and turbocharger. Additionally, misfiring indicated by the check engine light, often due to faulty coil packs, spark plugs, or fuel injectors, can further decrease fuel efficiency. Underinflated tires have also been reported to negatively impact fuel economy by increasing rolling resistance. Furthermore, some owners experience gas backflow during filling, which may be linked to low fuel pressure causing a lean condition and potentially necessitating fuel pump replacement to protect the catalytic converters. Lastly, electrical issues have been noted, including a battery monitoring system that can disable the alternator at around 12.1 volts, affecting the battery's charge level. Addressing these concerns is crucial for resolving the various issues related to power loss, fuel efficiency, gas backflow, and electrical performance in the Nissan Titan.