I've had mine mounted to the boomba rail for a while, 3 90 degree earls fittings later, I decided to replace it with an -8an line. The vibrations put stress cracks in the fittings and one minor movement of the fitting, such as me loosening it to work on something, and it would spray fuel afterwards. The fact that you have a straight fitting may make it hold up, but the fuel rail I use is way more beefy than that so my weak link was the fitting, cant say how that rail will handle the weight and vibrations. I'f you're worried about the smaller -4an lines restricting flow, run a larger one like I did. It'd does make a difference.
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