The fuel gauge was jumping erratically from full to empty to half full and so on. I cleaned the battery terminals and the gauge settled in at a little more than a quarter tank with no more erratic jumping so I thought that the issue was resolved.
About a week later I put $150 in fuel in. When I started the engine the needle pinned to full. While underway occasionally the needle would sharply jump from full to empty and back again but always to the full position. Also, $150 in fuel add to the existing fuel should not have been enough to completely fill the tank but it would have been very close.
I have 2 questions. I it were a ground issue wouldn't the other gauges be effected as I think they're sharing a common ground? And, if it is an issue with the sending unit is it accessible on my SD217?
FYI. This earlier post will give more background in to this issue and what previous steps I took: http://hurricaneboats.vanillaforums.com/discussion/789/tachometer-has-stopped-working#latest