majortom-RCU is correct, you want the tee on the pressure line to be between the check valve and the tank. Otherwise, you can never relieve pressure from the tank. It is also a great idea to mount a fuel filter in the pressure line between the engine and the check valve to prevent crud from building up inside the check valve. I see that both of your tee's have built in fuel filter, so you might need to switch to a plain tee without filter after the check valve and install a fuel filter before the check valve. It is also a good idea to color code the fuel lines to avoid confusion. Look at my picture above and you will see that the pressure line is red and the feed line is blue. It is impossible to get the two fuel lines mixed up while fueling or venting.