Fuel pump question,
 

I have been battling the vapor lock problems as some other have, today it happen again, I disconnected the vent tube and she fired right up, when i did this I noticed air was pushing out of the vent, I then checked the starboard side which i have never had any issues with and it wasn't pushing any air out, so it got me wondering if the port fuel pump is starting to fail,

thoughts??

thanks ahead of time