Lil Wayne -- Sued by Tour Bus Driver ... He Threatened to Kill Me!!!

Lil Wayne is being sued by his bus driver who claims the rapper was trying to kill him.

According to the lawsuit -- obtained by TMZ -- Mark Jones claims he was hired to drive Wayne and crew around for his 2014 summer concert tour. First stop: Buffalo.

Jones says he pulled over at around 11:30 PM for gas. He says Wayne became irate and started cursing, to the point the driver became scared and continued driving without refueling.

But Jones says Wayne kept his tirade going, threatening to pistol whip him, "whip [his] ass" and finish the job by killing him.

Jones says at that point things escalated, and Wayne came at him with a gun, cocked it at close range and demanded, "I want to get to the hotel now."

Jones says he obliged and the 30 minute drive was in total silence.