I get the code only after 200 miles plus only while pulling my 12,000 lb trailer, I drove 350 miles one way and the code only came on once at about 300 miles and once on the way home at about 300 miles. I'm thinking it's something hard to trouble shoot cause it doesn't happen often enough
The rubber section of the line could become kinked or collapse. Fuel lines that kink or collapse may induce a fuel system restriction and it needs to be repaired. there is a service bulletin
http://silveradofuellines.blogspot.com/2012/05/tsb-bulletin-silverado-fuel-lines.html
also a DIY (do it yourself) to help you replace the line
http://www.dieselplace.com/forum/76-gm-trucks/64-maintenance-fluids/430062-collapsed-kinked-fuel-line-repair.html
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