Re the Facet, we discussed this a bit when you were having the fuel pump woes. I was thinking more of a flexi behind the engine just before the pump.
You can always cut the metal pipe to put a flexi in, jubilee clips will hold it just fine. If you are worried about leaks you can put an olive on or near the end or run a ring of solder around it, then heat the flexi in hot water and shove it over that before securing it with a jubbly clip. Or you can flare the end if you have the tool. But honestly, I'd just use one, or if you prefer, two jubblys.
Obvs I have forgotten, but there must be a bit of flexi somewhere to stop engine movement cracking any solid pipe connecting tank to engine/pump/carb.