Hasqvarna Chainsaw 455 Carburetor Fuel Flow

My Hasqvarna 455 Chainsaw was running rough, then stopped running all althogether.  I decided to replace the Walbro 6874 carburetor and fuel lines.  After removing the carburetor I realized the problem was disintegrated fuel lines.  I replaced the carburetor anyway, as well as, the fuel line.  Yet, the chainsaw wouldn't start at all.
 
I wrote down the fuel line flow, but figured it may be wrong.  A video online showed how to test the flow with the carburetor out.  It said the primer sucks fuel out of tank through the carb, rather than pushing it in.  I connected fuel line to intake, then outtake to primer and tested.  I can't get the fuel to flow with the carburetor out.  It is also a new primer and I test the pumping direction as well.
 
Is the video correct, should the fuel be able to flow through carburetor when out and attached to lines.  I tried sucking on each fuel line connector, but can't even get air to flow.  Any thoughts?
 
I can attach photos if the need be.
 
Thanks,
Don

I'll send that info when I get home from work.  I got the 6874 right off the original carb.  But basically what you are saying is that the fuel should flow in one direction with given the proper suction.  If I check each fuel connector, then only one should be able to pull fuel from a source.  
 
Then carburetor I ordered, which appears to be an exact match is 
TOPEMAI WTA-29 Carburetor for Husqvarna 544883001 455E 455 Rancher

Check the vent under the flywheel cover