1994 Sable, 3.8 V6. During hot weather, heat soak from the road surface causes extreme pressure to buildup in the gas tank. In extreme circumstances, gas fumes will vent from the front of the gas tank. On a hot restart, during hot weather, the engine runs rough for a few seconds. Occasionally, the engine will start to run rough even while driving or idling at rest in hot weather. There is also an odor of gas from the engine most of the time after it is shut down. Has anyone had these symptoms and know the problem? Ford dealer computer diagnostics show no faults.