My father in law's Jimmy wont start. It's acting like its not getting fuel (tried starting fluid, nothing). You can hear the fuel pump turn on. Rolls over fine, just wont catch. Hooked a computer to it and it didn't find any codes (yes we checked it correctly). Ran perfectly fine, let it sit for a day and this is what it has been like since. Any ideas? I can't remember the year right off the top of my head but it is mid-late 1990's.