I have had the 1997 glastreon 185gs with a 4.3 Volvo for a few weeks now....Its worked great...last weekend the gauge was getting low...close to empty....I bought $80 worth of gas to put in the boat...After 20 litres or so it started overflowing....I waited for a bit and got another 5 or so litres in before it was overflowing...It seemed full but the gauge never went above half....Any thought what might be wrong...All connections seem to be on....They are the original Faria gauges.Thanks