code p0171 on 2001 toyota tundra

2001 TOYOTA TUNDRA
17,800 MILES
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THATSMYDAWG1
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2001 toyota tundra v8 4.7l 178,000 got a code p0171 running lean and o2 sensor heater element. I cleaned maf and briefly checked for vacuum leaks. Fuel filter has not been changed in 110,000 where do i start to find whats causing lean running i am thinking fuel filter..i need help
Sep 10, 2012 at 6:46 PM
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KHLOW2008
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Start by changing the fuel filter.
Sep 10, 2012 at 6:55 PM
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SATURNTECH9
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What is your actual fuel pressure and how did you check for a vacuum leak?
Sep 10, 2012 at 6:56 PM
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