I have removed a totally electric fuel system from my RV7A and have redone it to a Vans blueprint system with one mechanical pump and one electric pump. Once complete, everything was pressure tested with no leaks found. Now after 10 flight hours I have found leaks coming from the 90's where they connect to the fuel selector valve. When I was assembling this system, I could not fully tighten the 90's because they would be out of position to line up with the fuel lines coming from the tanks. There must be a simple solution to this I just can't think of it. Any help or ideas will be greatly appreciated.