Ok i have a 2002 3/4 ton 4x4 5spd, and here recently i have noticed that when i stop to get fuel and go to unscrew the fuel cap, it blows off like its under ALOT of pressure, does any1 know what could cause this so i can get it fixxed. If it wasnt for the little cord holding it on i think it could realy hurt it it hit me. Any help would be great