IMO the remaining risk areas here are how well the nitrile-impregnated gasket and the wiring pass-through tolerate exposure to liquid fuel over time. Both are engineered for a top-tank installation. We'll see.
I suppose I've volunteered to be the guy that finds out.
So ... my clamped-hose strategy didn't work too well. As soon as I drove around the yard the tie-rod knocked the outside hose off. It was sticking out about 40mm from the bulkhead. Too far as it happens.
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New approach: This has a stickout of only 25mm.
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Plumbing got cleaner too.
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Max
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For anyone still here I would like to cap this thread off. The car has now been driven some and I got a 158 mile trip in last week. The only issue I've had was a slight fuel seep where the wires come through that pass-through. I solved that with epoxy. The gasket is holding up just fine.
One annoyance is the sound of the pump. It's louder than I like and I will probably go back in and add some sound insulating material to the mount.
All in all I'm claiming success for this experiment. If I do this again (on my KG) I will pay closer attention to where the fuel lines exit the tunnel so they aren't close to the tie-rod.