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Yes, there is a fuel sensor in a 2000 GMC Sierra.
Fuel pump whining comming from a03 gmc sierra
how do you replace a fuel filter on a 1985 G.M.C. High Sierra
In the fuel tank.
The 2014 GMC Sierra-2500HD runs on flex-fuel (FFV).
The 2013 GMC Sierra-2500HD runs on flex-fuel (FFV).
The 2010 GMC Sierra-2500HD runs on flex-fuel (FFV).
The 2014 GMC Sierra-1500 runs on flex-fuel (FFV).
The 2013 GMC Sierra-3500HD runs on flex-fuel (FFV).
Fuel injection
in the fuel tank
The 2012 GMC Sierra-3500HD runs on flex-fuel (unleaded/E85).