B a r r y wrote:

With the exception of the cap (which is usually part of a good preflight
on GA aircraft), the rest are fuel system failures, not "running out of
gas".

AOPA's Safety Advisor categorizes fuel accidents as fuel exhaustion, fuel
starvation, and fuel contamination. Don't see a category specifically for
fuel system failu

http://www.aopa.org/asf/publications/sa16.pdf

The 2004 Nall Report has an all encompassing category called "Fuel
Management," where these accidents are then broken down into the three
types I listed above. Again, no specific category of fuel system failure.

http://www.aopa.org/asf/publications/04nall.pdf

Running out of fuel specifically because the pilot failed to fuel properly
is pilot error, but running out of fuel for any number of other mechanical
reasons may not be. If the latter were to happen over dark terrain at
dark, it might be reasonable to call this "bad luck," because it certainly
would be outside the pilot's control.

--
Peter