It is located midway along the frame of your truck.
Remove the fuel filter from the bracket on the frame rail.
Replace the fuel pipe O-rings if you find any cuts, nicks or distortion
in them. Slide the new filter into the bracket. Remove the caps you put
on the fuel pipes and connect the threaded fittings back to the filter.
Tighten it to 18 ft-lbs.
Read more: How to Replace a Fuel Filter in a GMC Sierra ' eHow.com http://www.ehow.com/how_4507468_replace-fuel-filter-gmc-sierra.html#ixzz14Xs33Ii1
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