I have a 2003 Tahoe 5.3 Flex Fuel LT 2WD with 90k miles. I only use 87 octane, no ethanol or other flex fuel b.s. Last night I filled up the tank, and drove it home. A few minutes later, I tried to start it. It cranks over strong, but did not fire. The cranking was strong, the headlights were bright, the power windows worked. So I figured the battery was good. I jumped it any way but still didnt start. I'm thinking it's a fuel issue. How can I trouble shoot the fuel system? I dont have the manual. In the fuse box, which fuse is for the fuel pump and relay? How should I determine it is for sure the pump before I pull the tank? Any tips on removing the tank? Any specific brands of fuel pumps? Thanks!!!