I agree the obstruction is somewhere in the distance your new hose covers.
but this obstruction is not nessassarly a Kink in the hose.
See in the picture where after pipe goes over copper line, than sags before going up into basement? if that sag is enough that water can fill 100% of the line that same water is going to cause a block, preventing additional water to get into tank unless you pressurize the fill side to force this water to keep moving.
by bypassing this sag with new line your introducing fresh water after that sag.
a restriction in the vent line can compound this water stuck in the low point of the hose.