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Airdog 100 and pressure is at 30 with return hooked up and 19 unhooked

Ok i have the vulcan kit to take the intank pump out. I cut the line below the t and hooked the return to the output side as the instructions said. BUT my fuel pressure is to high. I unhook the return and it is fine is there a check valve in that t that will block fuel from returning to the tank. vulcan said cut the hose on top of the t . Any none else had this problem, If i do this will the return fuel still fill the canister. Wrong forum this is a 01 3500 if some one can move it