Table 1 shows one common other fuel system related problems of the 2014 GMC Sierra.
| Problem Category | Number of Problems |
|---|---|
| Other Fuel System problems |
I started my truck and noticed a heavy smell of gasoline coming from the hvac vents. I stepped out of the vehicle and noticed a large puddle of (fuel) gasoline on the pavement and a constant drip of (fuel) gasoline coming from the rear of the motor. I proceeded to turn the vehicle off and contact my local gm dealer for assistance.
The truck was averaging about 20 mpg but shifting erratically like it couldn't decide what gear to be in. After using the 4wd the first time the mpg dropped off to about 17 and has been declining steadily currently I get 14 to 15 mpg and drive 150 miles per day mostly highway. I have taken it back to the dealer twice they said the computer couldn't get used to my driving style and reprogrammed the computer. When I took it back about the mileage a guy came out and said he could tell if something was stuck and switched the 4wd a few time and said it was fine. My mpg is getting worse and it slams in and out of gear 2-3 times in a matter of seconds while sustaining a steady highway speed on a flat surface.