I know that this is not the actual way to test a Walbro pump but I have to ask. I have the pump hanger out of tank and I turned pump on halfway submerged in gas. The question is should I be able to stop the flow of fuel by placing finger on out flow tube of hanger. I'm on my 3rd headgasket just want some sort of verification of this. I am able to get 45psi at fuel rail vaccum line off with guage. I was able to notice that I had slight fuel bleed by under 1 of my clamps while restricting outflow... For now on I will run 4 clamps on hanger to pump hose.