ZDX V6-3.7L (2010)
5. Using the special tool, tighten the new locknut to the specified torque.
NOTE:
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Before tightening, align the marks (C) on the fuel tank and the locknut.
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After tightening, make sure the marks (A) are still aligned.
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After installation, check the base gasket, visually or by hand, to make sure it is not pinched.