Miata Mailing List: September 1995, Message #44
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   From: "Robert Cohen" 
Subject: Re: Fuel Filter replacement
   Date: Fri, 1 Sep 1995 15:59:39 -0400

        Reply to:   RE>Fuel Filter replacement

scott.j.zimprich wrote about difficulty in removing the plastic shield that
surrounds the fuel filter area.

There's an excellent description of the connectors used for the fuel filter
shroud in the Miata Enthusiast's Manual.  Essentially, the connectors look
like a hollow wall anchor device, with a plastic screw inserted into a vented
plastic collar that expands when seated.  The problem is, as you found, that
they seal well enough to fasten the connectors, but not well
enough to stop the rotation.  The manual suggests to hold a flat-blade
screwdriver under the collar part and gently apply some torque, while slowing
unscrewing the screw. It worked for me (about 4 weeks ago).  
Also helpful was to thoroughly clean the road grit from the area, so
they unscrew easier.

Amazing how much dirt was in the old filter.

Good luck, 
Bob
Buffalo, NY