Check your Harley fuel line & fittings for possible leaks at every service or as part of your pre-ride inspection. It will be more likely to establish a Harley fuel line or fitting leak if your fuel tank has been removed a number of times. In this case, the o-ring inside the output valve can be compromised. Otherwise, a leak is unlikely.
M-8 models now have a fuel pressure fitting on the output valve for easy access if a fuel pressure test is ever needed to be performed.