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there is no ground wire it is grounded through the case
Yes, there is a fuel sensor in a 2000 GMC Sierra.
On a ( 2000 ) Lincoln Navigator the rear window defroster switch is located in the dash below the headlight switch
No, the defroster should work.
Use a soldering iron and solder it back on.
The 2000 GMC Sierra OBD 2 port is on lower edge of dash; right of parking brake
Probably for the rear window defroster
you dont
14 or 15 Mpg
Fuses blow due to overheating. Overheating is caused by, a short in the wiring, bad ground, overloaded circuit, too small a fuse for the load, short in the assembly the fuse is protecting, etc.
Your 2000 GMC Sierra Vortec might be hard to start because the battery or the starter are worn or dead. The GMC Sierra might also be hard to start because of a clogged fuel filter.
5W30