I'm trying to find the best place to sample some fuel from the tank and lines to see if its contaminated.

First of all the car will not run. A shop has pulled the plenum and etc.

If I undo the line at the fuel rail , will the pump run and disperse fuel just from turning the ignition key to the on position ?

With some helpful tips, I found the panel for the fuel pump. If I can borrow the special tool needed is that the best way to pump all of the fuel out and clean the tank ?