Well Puc its about time you come out from the closet!
Somewhere I thought I got confused by your posting that started this knockdowndragemout conversation, but nope.
Now if you said that the FRAME was water filled and that the vent tubes were somehow placed inside the flooded frame, then yes which is what I thought you were leading to.
Water has roughly 1/3 more density then gasoline. Bear with me, now if the venting cycle had been reversed so that the tubes were then siphoning - the density would have a possessive/greater effect over the float; lets remember that the float is levered .
But in the case as presented we are ignoring the obvious: (picking numbers here) 11 fading pounds of manual & intermittent pump pressure at the radiator, not one but 2 fluids are involved, both a compressible and noncopressisble. The noncopressisble will have a direct effect on the fleeding pressure at the rad neck.
Lets continue: the piston on the intake stroke is somewhere between TDC & DTC, this means greater volume, and, the intake valve is open to atmosphere so how may I ask that the cause of applied pressure at the rad neck has anything to do with lifting the fluids into and up? There cannot be a pressure under the given scenario.
Furthermore Ladies and Gentlemen should the pressure exist to move the fluid past the intake valve then we must consider Bernoulli principle as well as Venturi because at this point the throttle is closed, therefore bringing both rules into play.
I beg your attention now be turned to chapter 5 p.2 just below the idle set position of the throttle plate. (unless it thought that the long path of resistance to the diaphragm is consequential?) we now turn our attention to the enricher valve, look up way up said the friendly giant, assuming the port is open (?) how would a fluid such as water or antifreeze make its way up then back down to the bowl with atmosphere being equal on both sides?
Is there another potential driving force? Well you could argue gravity which would be equal to the weight of the fluid above each potential infiltration point which will deprecate the higher the fluid measure is...
I Sirs, rest my case
and my Henglish