I am not your Mom....but
Just be aware, "black hose" is not a specification. Fuel flowing in hose can create various levels of static charge depending on the velocity and distance from the last ground. Proper fuel hoses are lined with a conductive material to neutralize the charge.
So what is the failure mode? Since you asked, after a few inches, the charge can be over 30,000 volts and can discharge through the hose to a ground nearby. It will create a super tiny hole and will weep fuel. This not theory, it is fact.
Most leaks of this type are in the nuisance category, but wet fuel does present a certain hazard. In my personal experience, the perforations were at a grounded metal fuel hose attachment point and involved high recirculating flow. The diesel fuel weep was slow and simply collected dirt and dust.