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No fuel at carb, beginner home mechanic question.

For those of you who don't know I am trying to restore a non-running '72. The engine turns over and I have spark but no fuel at the venturi. Today I took the fuel line off at the carb and cranked the engine - no fuel (BTW the tank has about 9 gallons in it - fresh). I took off the fuel filter, cranked the engine, no fuel from the line coming off the pump. I have never tried to do this stuff myself and I am hesitant to take the fuel supply line from the tank to the pump off at the pump because I don't want fuel all over the floor (I guess I could just elevate the end of the hose if that happens). If my fuel pump was faulty I should have fuel draining right now by gravity shouldn't I. Should I take the line off at the tank and flush both ways? All suggestions welcome. Also - what is the purpose of the small blue tank in the upper right front of the engine bay that connects to the gas tank via a fuel line - just a breather for the gas tank to prevent vacuum? Thanks again for any help.

Nathan
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