My fuel gauge reads 1/4 less than is actually in the tank (shows 3/4 when its full). It was installed new this year. Is there an adjustment I can do? Its in the water and I really dont want to bring it back to the mechanic - it'll take a week for him to return my call, one week for an appointment, and another before it finally is ready to take home. <br />How do I fix the adjustment?<br />Thank you