At 09:26 AM 3/26/98 -0500, you wrote:

>John,
>This is a common problem.  There is a hairline crack in your expansion
>tank.  I had one in mine and I could not see it (at 84,000).  Replacing
>the tank solved the problem.  At the same time I replaced the o-ring and
>the cap to the expansion tank.  I purchased the tank from the dealer for
>less then $60.00 and it included the cap.
>
>I suspect, part of the problem is that the expansion tank is right above
>the exhaust system, which will add to the temperature cycling, hence
>causing the tank to crack.

My humble personal opinion is that the sender sometimes gets over tightened
- with a new O ring it should just be 'snug'.

Austin