If you burn a whole tank every time you go out, never mind but we
usually get 2 or 3 trips on a fillup.
I came up with this to remind me to put some gas in before I get ready
to go. It is better than figuring out I am low after we are all on
board and I start the motor.
I hang this on the lift switch when I am putting the boat away if I
know I am low coming in.
I will see this before I get on the dock. Then I can get a can of gas
and put it in while the lift is going down.

http://gfretwell.com/ftp/gas%20reminder.jpg