Randy, I experienced the same slipping off the primer bulb of the fuel line on my solo lazer mag on my first trip this year. I put the line back on the primer pipe and put on a zip tie the same as you. I don’t know why the primer bulb doesn’t have a flared end. The straight pipe off the primer pump is not what you normally see.
I also have a broken on/off switch that just popped off a few years ago, nothing broke on it, it just doesn’t sit tight on the base and won’t stay put anymore, another bad design IMO.