You shouldn't need the asperator bulb. Even though it's working well for you, there's a problem somewhere. I actually have a fuel filter with a built in primer bulb. It's the *****. Don't go shoving that thing back in your kids nose now!
As far as the color of fuel line, the ONLY flavor you'll be able to see through is clear, which actually has a blueish hue to it.

Try charlieboy's idea about opening up the needle a bit. It makes complete sense.