fine as long as the tubing doesn't harden and leak at the barbed fittings with exposure to the fuel. small spring clamps would be good insurance.

i really would have left the hub full diameter for its full length. the stress riser mentioned in post 70 does come into play now. this isn't the type of part that you can periodically check for cracks, only failure mode here is catastrophic.....and if it does fail it can do some very serious damage. proceed with caution and maybe get someone with engineering credentials to look it over.