Other Fuel System Pump problems of the 2017 Chevrolet Colorado

Fuel pump weld crack, service 4wd message displayed, clunking in rear end all dismissed repeatedly from dealership I purchased my vehicle from. I bought this truck new off the lot which has been in the shop in excess of 10 times for multiple issues. The 4x4 started November 2017 I was told it was because we were having abnormally cold weather and it would come out of it. It has been in multiple times since then and they were unable to duplicate. Clunking in rear was dismissed as nothing, could not duplicate. I started smelling burning plastic, then when starting my vehicle in the morning the exhaust smell was so overpowering that it would gag us. The burning plastic smell was intermittent while driving and that was only after driving the truck between 2 to 20 or the full drive home and sometimes not at all. I had been nodding off, getting massive headaches and sick to my stomach while driving my truck, so was my daughter. No matter what they had my truck for, they could not duplicate the issue and I had a loaner for a week at a time. I took my vehicle to another dealership who just ended up sealing my pickup box, replacing fuel pump module, installed a body plug per a bulletin, per bulletin applied lubricant to both rear leaf springs and torqued leaf springs to specs. Transfer case control module had a bulletin for which my dealer stated they put dielectric lubricant. I was driving a vehicle with my child in it with carbon monoxide poisoning us based on the symptoms we were both suffering, exactly when would that have been duplicated, at autopsy???? I don't trust this truck, I don't want to drive this truck, I hate this truck now and I am stuck with 5 years of payments and something that tried to kill me. How is that for safety!!!! my opinion only!!!.