I wouldnt. I've gotten really good at starting they syphons, i hate changing the water in my BW tank... so salty...
or...fill the hose at the tap first. Even easier IMHONO!
And why the heck would you ever have to suck the end of a gravel vac hose to get it going? Just immerse the vac and hose under water except for about 5 inches of the hose and cap that end with your thumb. Take that end and stick it in a bucket on the floor and release your thumb and the flow will start.