Tank Mounting problems of the 2003 GMC Envoy

2003 Envoy slt -135,000 miles --ses light on, local mechanic said small evap code indicated inlet checkvalve fracture- they said go to gm dealer for help with this,info printout from local mechanic given to me- "all data motor" said recall spec. Coverage for ext. Size models of Envoys etc. Offered by gm for period of 10 yrs or 150,000 miles. (also 11/04 they did work warranty work on code 440 and replaced seals,tank unit, I think they caused this because I was having the ses light on&off years and just told loose gas cap- so I bought a new one but now this! dealer looked and said "no" after I was there for 5 hrs. Said I could buy a new gas tank @ $1200. I said I didn't have the money. Told I could call gm so I did. Thought I would get "goodwill" help for same problem as they paid for the extended models. I talked to two reps . Rep said my VIN was listed in the coverage range of #'s but not my model. But she proceeded to take my info in order to get me some help. . Dealer called me back 4 days later in a hurry to look at it again with another mechanic that apparently their district gm person said to do. The home office for the gm service person called them with my complaint. They still looked at it and saw the gas leak at the icv and then still just told me "no" that my model didn't qualify for help like the extended Envoys did. I told them it appeared to be the same engineering problem so why wouldn't my model be covered? my service rep just said I would have to buy a tank. I said "no". He said just keep the gas tank below half full. So that is what I have done for the past week. I don't want to trigger that ses light by filling up the tank near that hose inlet. This does not make sense that they will not cover this problem for my model- is there some big difference on extended length? maybe enough short Envoys and trailblazers haven't sought help for the same problem. Is the engineering design of gastank and icv different on the short and long model Envoy??.

I could smell a gasoline odor around my 2003 Envoy (45,860 miles). Took vehicle to coulter of tempe (an authorized gm dealer) and was advised of a leak at fuel inlet to tank pipe area. Was told gas tank would need to be replaced. Gm has had a similar problem with the 2003 Envoy xls and issued a letter dated June 2007 covering the entire amount of replacing these fuel tanks for 10 years or 150,000 miles. This coverage should be extended to all 2003 Envoys and a possible recall issued as this leak at the fuel filler neck seam at the tank is not easily identified unless vehicle is hoisted on a lift. They did offer us a deal where we were charged a warranty deductible of $500, but I feel this repair should have been covered in its entirety.