Consider eliminating a leak source by plumbing direct to tank while you are at it. Unless someone here has a good reason to have it. There are none on later eras. If you need to stop fuel from leaving tank, squeeze the rubber hose.
Well,
I just brought a truck home with a new tank in it and no shutoff valve, I'll put one back in as soon as I run it out of gas.
The shutoff valve is real handy if you need to:
-Replace the fuel pump
-Fix any lines or leaks between tank and fuel pump
-If you have a glass bowl fuel filter on the pump and want to remove it to clean the screen.
-to service any other fuel filter you may have installed lower than the gas tank (fuel level).
Grigg