Dennis,,

Yes it is glassed in, no it is not reasonably accessible and it is a real PIA to replace with the original hose.

I cut off the ends by the bilge sump and by the engine, then snaked a new smaller diameter hose through the old hose section, used and adapter at the pump, and replaced the strainer to match the diameter of the new hose. Cut your hose, then take a portion to a marine supplier and see what you can snake through the center of it. Then buy the entire length with the adapter. I used soapy water to help when I snaked it through the old hose section.