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Q: trouble codes on 2001 Ford Explorer

id like to know if a faulty gas cap would cause trouble codes po 171 and 174.when i bought this vehicle the check engine light came on shortly after.
i took it to the place of purchace and told them the first code which said loose cap or canister cover.they said it was probably a bad gas cap .know it shows these two new codes which says its burning lean in bank 1 and bank 2 thanks for any info
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The link here does not work. I have this persistent 171 and 174 code. Have done the fuel pump, fuel pressure reg, new 02's, cats, new maf, fuel filter. Still throwing codes...help!
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