Hey Ward- I had the same problem a couple of years ago and it turned out to be a pretty easy fix. I used a fex-head 1/2" drive to remove/replace the plug and that worked very well (there was not much room between the plug and the firewall). Just be aware that there will still be some oil in the rail, so when you take the plug out be ready for an oil spill (don't ask me how I know that!!!) Good luck! Pete