Dealer, Salvage Yard, and many sites online. You may be able to get an owner's manual online at the GM website. https://www.mygmlink.com/main/US/en/gmc/home
Ebay =)
http://www.extendedgmwarranty.com/owners-manual/gmc/2005-GMC-Yukon.pdfadobe acrobat required
The Owner's Manual will have a diagram of the fuel system in the 1999 GMC Yukon. If you do not have a copy of the owners manual, you can contact GMC and they should be able to resend you a copy.
Whrere is the spare tire located on a 1996 GMC Safari?
You should be able to get a repair manual from any auto parts store, Haynes, Chiltons, etc. If you want a vehicle specific repair manual you can usually find them on ebay. Simply search for "factory service manual 1991 GMC". If you plan on keeping the vehicle for any length of time the factory service manual is by far the best route to go. If you are looking for an owners manual, same place (ebay) only use "owners manual 1991 GMC Jimmy" as the search.
It is important to have properly installed belts in a car. The diagrams for installing a belt for this car are found in the owners manual and the maintenance manual.
Read your owners manual.
All of you wiring should be listed in the owners manual. Depending on what wiring you are looking for, you should be able to find a diagram.
My owners manual says 27 gallons
it takes 14.5 quarts for the isuzu engine in a 2002 model year truck. steve had to find answer in owners manual.
Owners manual (available for download online) says 190 horsepower
6 quarts. But check your owners manual for sure.