[Walt Fricke]

Agree with Magnus. The problem with the Porsche hose is that eventually it leaks, not that it needs some specific shape.

However, one way to prevent a kinked hose is to insert a spring inside it. That is common on large diameter hoses which are subject to a vacuum, but should work here also. I'm unsure how much effect the reduced effective diameter would have, but my guess is not enough to matter.

Doesn't the filler neck have two tubes for hoses? One for the crank breather, and one, pointing a different way, which connects eventually to the center of the rubber boot between the two halves of the intake system? Maybe you have these reversed?