I wouldn't let electrical connections in the tank worry me much, as long as the connections are positive and not going to spark. I just replaced the fuel pump in my wife's fuel tank, and the +/- 12V connections that run the pump are right there in the tank, submerged most of the time, but not when it's low on fuel. They are positively screwed down to a terminal with a nut though. No spark, no worry...
Mark Langford ML at N56ML.com http://www.n56ml.com
