574 gas issues

I feel like this is really basic question, but I don't know the answer so I'm asking. Is the fuel pump gravity fed or does it pull the gas from tank? I have plenty of fuel to and thru the sediment bulb but can't seem to get fuel out of the pump. When I remove fuel line from carburator side of fuel pump and put my finger over pump outlet and turn the engine over I get no pressure. Shouldn't I feel something? Should I assume pump is bad?
Thanks
 
To be sure the pump is bad and the line not crushed or plugged, try to blow air through it. If the air comes through, the pump has to be bad. 90.00 I think mine was from IH.
 

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