For about a month or so I have noticed the fuel guage acting funny. When I put in a full tank of gas the needle goes slightly past the 3/4 mark but not all the way as should.

Another thing I noticed that when I put the key onto the "ON" position the needle moves up. If I put the key onto the "ON" position again it would move down. Then it would go up the next time I put it onto the on position and so on.

Any inputs or suggestions are appreciated.

well my guage sometimes liked to drop all the way down until it cant go no more... (past the little circle light) usally when im low on fuel.. I wonder why.. sorry if this is o/t to your question but I would like to know as well..

I had the same prob with my max, top the tank off and it wont register anything more than 3/4 tank. It was still under warranty the first time and they replaced the sending unit, the gauge itself and i dont remember what else. worked for a while but acted up again. try running your tank to empty and filling up and see if that does anything, it worked for me a few times. i did replace the evap canister valve a while back and havent had it happen to me since, i dunno if that coulda been the problem or not. hope ya figure something out.

I replaced the evap canister and the valve in June. I'll have to take a look at it again. Funny thing is I had the guage problem after the canister and the valve was replaced.