Hey Mulli, sorry to hear this is still kicking your butt. I`ve been following this thread from the begining. A lot of good tips thus far and the inverted trap was definetly a nono. If it were mine, I`d do away with the electric pump/or bypass. Pull the carter and replace with a factory style. Also as recommended, check the sender sock, r/r if nessary. I have one of those carter pumps too, It was delegated to a conversation piece very early of its life. You should be able to see the sock, with flashlight, straight down in filler neck. Keep us informed of solution, good luck
