stuck gas tank vent pipe

[Enrique Claure <spanlab@ceibo.entelnet.bo>]

Hi list, I finished putting in the vent tank and pipes in the trunk. 
However when I blow or suck at the pipe it seems to be plugged. I have 
tried to push a wire through the pipe, drop engine cleaner, gas and even 
applied 100psi of compressed air to the pipe with no results. Any ideas? I 
would hate to have to go trough the work of changing the darn pipe. Thanks, 
Enrique