Quote:
Originally Posted by FLexpat
I think most fill hoses have a spiral of wire - mine did - that will keep it from collapsing with a vacuum. But it opens up an idea - if you pull the wire out it may make the hose more flexible and collapsible. That might free it up from the foam a bit.
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I think at very modest vacuum, like shop-vac level vacuum, you are right. But if some boat builder has a real vacuum pump, then 15 PSI x all those inches of hose area should buckle it at a bend and continue collapsing from there, I would think.
A tank won't take any real vacuum, so the hose doesn't need to be engineered to either.
*I think*