This filter is for plastic hairpin fittings on older trucks - the correct filter for this truck has much longer nipples. Now that this stainless fitting is locked on, there's no room for the safety clip, or for a tool to release the fitting. The only ways to remove it are 1) to pull or pry until the bail inside crumples, or 2) to cut the nipple off the filter so a tool can be inserted. But the risk of sparks is extremely high when cutting metal, so the filter body must be cut open first to drain the fuel & remove the paper. A handy fire extinguisher &/or water hose are still required.

'87-96 fuel filter Motorcraft FG872 long nipples work with both styles of quick-connect
'87-91 (short nipple) FG1060 or Motorcraft FG800A plastic duckbill quick-connects ONLY

See also:
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Owner caption August 2010 · Photo 3281 of 5000