its on my 96 Dodge Ram truckwith a 318....When I turn the plastic filler cap counter-clockwise it just clicks like a clutch to prevent it from overtightening is failing to engage. Can I just drill through the plastic cap and insert a long screw to keep it from slipping?? The engine was hot.....I'll let it cool and see if that helps...

Any other suggestions? Thanks for the help on a non-Merc issue.....

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Eric Boyles
1980 450SL