Fuel Hoses Lines/piping And Fittings problems of the 2006 GMC Sierra 1500

Driving 2006 GMC sierra pick up in utah on hwy 191 in a cross country move and pushed off the road to the side by a trucker franticly telling me to run from the truck,it was on fire. Local fire department concluded their investigation that it was the fuel line leaking as cause of origin. Also state highway patrol concluded the same at a later date. I submitted a claim for the contents to gm and was lied to for 2 months before them saying it was not their fault. They investigated the vehicle without consent from state farm. The only consent was to photograph. They spent 3. 5 hours completely investigating with no supervision. The woman handling the claim at gm said to me at the end that quote "sometimes they step up to the plate and sometimes they don't,sorry" and denied the claim. Now they refuse to speak to me or release their report so I can retain an attorney. They have lied and cheated through this whole process with other burned late model gm pu's are burned right next to mine in that yard. The truck has been stolen from, rifled through,a nd compromised by rain and gm. Now it is finally shrink wrapped in plastic and waiting for the next step. Please help as soon as you can by investigating this. Thank you.