According to my research most cars do not seem to have a drain in the gas tank.
This is obviously a problem because there is no way to get water and sediment out of the bottom of the tank if there is no drain. It became a problem for me the other day because there was a warm, humid day followed by a cold night which produced condensation in the tank, then I parked on a slope, which apparently pooled the water. Then the car would not start because it was sucking water.
Airplanes always have drains in their tanks so that all water can be removed. Why are there no drains in car gas tanks? Can I make a drain in my gas tank?