Ok just a couple questions. My 99 z needed a fuel tank, so dropped it out and it has 4 lines running off the sending unit, 2 from the smaller hole and then the filler neck tube. First question, what is the second line next to the charcoal canister connection in the smaller hole? Second question, can the sending unit from the old tank (steel) transfer into a plastic tank? Mainly need to know what the second line is for next to the charcoal canister connection because I have 3 different tanks I can use but none match the first which was a 99 steel tank, the others are 2000+ plastic and dont look the same so someone tell me why. Any help would be appreciated.