nope, no credence at all.
I think it's going out the bowl vents, at least dropping below the accel pump prime level -
FE, remember, we're talking AFB's here, not factory carbs like your 1bbl
I've had this issue ever since I built the motor/truck 14 years ago - it never occured to me to run a heat sink spacer, and I have not explored that avenue.
Honestly, I've just lived with it. But, since it's been parked for 2 years rusting quietly in the woods behind the barn When I dig it out at some point soon I will begin by delving into this mystery and hopefully reaching some conclusion besides adding a priming electric fuel pump.
