The bubbles in the line are an issue, and do need to be addressed.
The line is for fuel only, and settings will always be whacky with bubbles there.
Most common cause is a leaky remote needle valve. They are worthless.
Remove the needle, and replace the O-rings if equipped. If not, slip a
small piece of fuel tubing over the needle and screw it back in. (will help seal it)



However, your current problem of dying only when glow removed is due to
a "too rich" problem, or a bad glowplug. You may be too rich at idle because
you've had to tweak the engine rich to compensate for those bubbles, yaknow

Try another new plug (even if you already have) if leaning doesn't help.