ok so a while ago you guys helped me diagnose my fuel guage problem. Determined it was a bad sending unit. I got one off ebay that looks to be the same as the ones in all the good impala catalogs (just a little cheaper). My old one was the old soup can style which doesnt appear to be made anymore. Anyway, I replaced it and got it all back together but now it only reads a little less than 3/4 full after ive filled the tank (23-24 gallons). accordingly, it reads empty about 1/4 before i actually am empty. Any ideas??