Scott Moore wrote:
Yes, this is a stupid question, and somewhat off topic for IFR.

But I get better answers here than elsewhere.

Question:

Why is it that devices to separate water from fuel are quite
common cars (my F-350 truck has one), but such a device, which
could save lives in an airplane, is not offered for airplanes ?
Even as a retrofit ?


Your F350 is a diesel. Gas engines in cars and trucks don't have water
seperators. Cars and trucks don't have a way to test the fuel like
aircraft.