Originally Posted by Michael Johnson (Post 6309678)

I have a 1991 rs with a 305 tbi. And my gas gauge would always show a quarter tank and every once in a while it would show 3 quarters full. Now i finally got to tackling this problem and found "more" stupid things the PO had done. I unplugged the connector and the gas gauge went to full which i thought was normal but I've seen Youtube videos saying that when its unplugged it needs to show empty. I cant seem to find any wiring diagrams but i have found that the purple wire runs to the gauge and the grey is the pump. And that's about it. I have a strong feeling it's a float problem. But i haven't taken the whole sending unit out yet. Also there is a strange yellow wire that the PO wired to the float resistor and that's another thing that could be problematic. All I've done was pulled the sending unit out a little then shined a light in to see whats going on in it. But before i pull the whole sending unit out i would like to have the correct wiring diagram. If anyone could help it would be most appreciated. Also its my daily driver for at least the next month or 2 so i don't really have much time to any major things like taking the whole sending unit out. So when i do u want to be sure i have the correct info. Anyone who can get me a wiring diagram. I would be so thankful