What is the best gear to use when towing a boat with a 1999 Chevy Suburban 1500?
That truck being a rather new one might be a Z71 towing package. If it is it's at the end of your turning signal lever there is a towing button. Push the button while the truck is in nutral. Then just go in normal drive and you are ok. But if not don't worry you can just go in normal drive or you can use 1-3 gears for better fuel management. BUT you should be ok no matter what because in 1996 GM began puting Vortetch 350ci engines in most trucks witch boasts power over most full size trucks.
How do you relieve the pressure in the fuel lines to change the fuel filter on a 1999 Chevy suburban 1500?
Cabin air filters didn't come until 2000 on the Suburbans. The pickup had them in 1999. The body style change along with features like cabin air filters came first for the pickups in 1999 and then for the Suburbans Yukons etc. . I own a 1999 Suburban 1500 1999 Suburbans DO have a Cabin Air Filter, here is the location: http://www.wixconnect.com/assets/wixcabinairbrochure.pdf