Fuel pumps (and most other pumps) are much more efficient at pushing rather than pulling. If there is any restriction in a line between the pump and tank you have to worry about vaporization due to the lower suction pressure in the line. .
How could I test to see if there is in fact vaporization going on (ie vapor lock)?
when the problem occurs, there is still gas at the carb because I can work the throttle and gas shoots out just fine...when I remove the fuel feed hose from the carb, gas comes out......I would think that if here was vapor lock, the carb would be dry....wouldnt it?