|
They self prime, but it takes a few seconds... I think that is the problem. I suspect, without proof, that the priming function is slowed down because of the now bulbous shape of the tube... forcing it to suck more air. There is probably the same momentary loss of suction as the older engines, but it now takes longer to re-establish prime and flow.
Actually it is the difference between atmospheric pressure and the pressure at the top of the inlet tube that pushes up the fluid... the rotating impeller simply reduces the pressure a little and up comes the fluid. But all of this takes time.
|