I assume this is a Rocket so the fuel valve will be close to the centerline. That said, it's still tight. I would NOT recommend a bulkhead fitting on the side of the fuselage. It's one more fitting to leak, adds cost and weight, and will probably not simplify line installation. The fitting on the tank end can be a simple 180 bulkhead unit - no 90 needed. Locate it a few inches away from the pickup and just run the line straight to the fuel valve. I was able to add solid lines in a flying aircraft without much trouble. In fact, my entire fuel system can be removed/reinstalled without tweaking any lines. It can be done with some forethought.