...and it's been installed for months.
Obvious question, but was the filter changed with the tank? Sounds like you're just not getting fuel. Has the carb been rebuilt lately? If you had rust, you can have clogged jets.
1989 Blue LX Hatchback
2001 Red SVT Cobra Convertible (Phoenix)
2002 Black/Red GT (Ginger)
2011 Red Candy Metallic V6 (Manfred)
2016 Magnetic Metallic GT (Susie II)