2004 Yukon Will Not Start

[azfalconfixer]

I went for a camping trip this weekend with my 2004 GMC Yukon 5.3L 4x4 towing a toy hauler. Several miles from home I got a check engine light, it seemed to be running fine. I get the hauler backed in and shut off the Yukon. When I restarted it, it ran real rough like on one cylinder or so. A while later I went to try it again and it won't start at all. I down loaded P0171 an P0174 codes. Lean banks 1 and 2. Any ideas??

[waynet]

I went for a camping trip this weekend with my 2004 GMC Yukon 5.3L 4x4 towing a toy hauler. Several miles from home I got a check engine light, it seemed to be running fine. I get the hauler backed in and shut off the Yukon. When I restarted it, it ran real rough like on one cylinder or so. A while later I went to try it again and it won't start at all. I down loaded P0171 an P0174 codes. Lean banks 1 and 2. Any ideas??

 

 

SOUNDS LIKE FUEL PUMP

[azfalconfixer]

That's my thought to. Only the fuel pump at Checker is almost $900!!!

[azfalconfixer]

Changed the fuel pump today and it started right up!!