5/16 in line fuel check valve

My 440 SuperBird can sit for 4 months and starts with one tap of the pedal and 2 quick cranks. I haven't touched the carb since I bought the car in '90 nor changed the fuel pump in my ownership. My Bee was the same until the day it wouldn't start last Fall... and the picture of that is above.. and here. Pump I put in probably in '88. I carry a new spare in the trunk of the Bird as I figure it's up next...
beefuelpumpissue 056.JPG