When should I reset the fuel pump on a 1991 ford explorer?

When should I reset the fuel pump on a 1991 ford explorer? - 1

When ever the need arises.
how to,
https://www.justanswer.com/ford/1vsgx-fuel-pump-shut-off-switch-located-1991-ford-explorer.html

Try resetting it if the motor won't start!