No, that is the generator pickup tube. It is connected to the generator fuel line...
Here's another image of the pump assembly, rotated about 180 degrees:
There are three tubes. The smaller of the three is the generator pickup tube; the large one in the center is the pump output tube, and the third, which is the same size as the pickup is the fuel line return. This tube runs down to a point just above the filter sock and takes a 90 degree turn. The end has a rubber nozzle - a type of check valve.
Also, look at the hoses on these three line - the blue and gray are pressure line - original factory. The third is my rubber hose I used to block the line while removing the tank. I removed the generator fuel line from this port.