In article ,
Andy Hawkins wrote:

And if you've left the fuel cap off in your pre flight, and your fuel has
gradually been ****ing all over the wing, how will you know?

In a low wing Piper, you look over and see the fuel flowing out of the hole.
You don't need a gauge to detect that hazard. (Perhaps this is another
advantage of flying a cherokee)

--
Bob Noel
(goodness, please trim replies!!!)