Fuel delivery problem?

[zacharywest34]

Hey guys, i have been having problems with my fuel delivery in my 1971 c20 350sbc with a holley four barrel double pumper. at first i thought it was vapor lock because it died on me a couple times in stop and go traffic but then i looked into it further and found the gas is just dribbling into the fuel filter before the carb. when before the fuel filter was full of fuel and now its not even a quarter full. i replaced the fuel pump with a holley 80gph pump thinking the fuel pump went and also replaced all the fuel line from the tank to the carb. Also i looked at the sending unit sock and found no restrictions in that. The only thing i can think of now is something on the carb could be out of adjustment although this only started 4 days ago and before that it worked perfect. Does anyone have any ideas? Much appreciated.
Zach