I am ready to start banging my head against the wall. Last year, when I re installed our gas tank, I bought a new seal, cleaned up that section of the tank and re installed a new sender. It leaked when the tank was filled past the sender. So I decided to replace the sender since we were going to pull the tank anyway. Pulled/drained the tank. Took it off. removed the old sender. Cleaned around the sender even though it was quite clean. Installed new sender and another new gasket. Did a quick test. No leaks. Filled up tank. All was ok. Went out this am..lost 1/4 tank of gas and you can smell it gas quite easily.. Re doing the steps above again would be an excessive in futility... Any suggestions ? Thanks Ian.