Did anyone experienced this problem on 05 Frontier:Clunks once after take off ,only if the engine was priorly shut off.Clunk comes from under the front of the truck, right after transmision shifts from first to second gear(automatic).Thanks for input
Todays vehicles have a pressurized fuel system, and if the gas cap in not tight it will not maintain a certain pressure in the fuel tank .. it will set an evaporative emissions code in the pcm.
Thats why you hear the fissssss when you unscrew your gas cap.