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Fuel pump/sender units on these trucks usually fail and do not give accurate readings. In addition, if you live where it snows, and they use road salt and chemicals, the sending unit tubes rot out and start spraying fuel all over the underside of the car. This is a fire hazard and is very dangerous. GM knows that these fail and they even recalled some earlier years. This should be a safety recall asap.
The location traps the road salt and chemicals on the top of the plastic tank, where they sit and corrode the gas sending unit and fuel pump lines (it is one unit). The replacement cost is estimated at $800.00. This should not be happening, especially when only some were recalled for bad readings on gauge. The sending unit has cheapo metal lines coming out of the tank that connect to plastic and rubber lines via quick connects. It is the metal lines that rot away and then start to leak under pressure.
These should all be replaced by GMC under a safety recall. If you smell gas, do not drive! This has never happened to any of my other vehicles, and I have owned many different kinds over the years, including other GMC and Chevrolet products. I wish they would make 'northern region' vehicles with coated brake lines and fuel systems. It only makes sense, and I am sure many, including myself, would pay more for such a package. This is a serious safety issue. Have your pump checked for rusting.
Hilton, NY, USA