Car stalled a few times at a low steady cruise today. Outside air was 87 and engine temp 190'ish. Checking carb and found vapor coming out of the front bowl vent which I have never seen before. Anyway as the video shows when I put my finger over the vent tube it shot fuel out and the engine stalled. Mechanical pump with 6-7 psi and fuel level is correct. The secondaries do not do this. Am I boiling fuel here or is the pump sucking air from someplace?