One problem related to other fuel system tank assembly has been reported for the 2015 GMC Sierra 3500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 GMC Sierra 3500 based on all problems reported for the 2015 Sierra 3500.
I see there was a recall from gm #17399 for the 2015 dual fuel tank sending unit problem. This is only for the 6. 0 l gas engine. I have the duramax 6. 6l engine in mine. I had the same problem with mine. The sending unit did not turn off the transfer pump and overfilled the front tank causing fuel to pour out all over the road. I caught it before the drive line caused any damage. I had it towed to the dealer and while we moved it to pull it up on the tow truck it was pushing fuel out of the filler neck of the front tank. The dealer ship refused to cover the cost saying its not part of the recall. They said it wasn't the same problem. It sure was. I have attached the repair order and the recall notification below. I am wondering if it is part of the recall and they are just not doing their job and honering it.
| Other Fuel System Pump problems | |
| Other Fuel System Tank Assembly problems |