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Alright, I’ve got a fun electrical mystery going on. My 68 GTX has a tanks inc tank with the electric fuel pump. I was using a traditional swing style sending unit, but it never worked. So getting tired of not having a working gauge, I decided to get the “floatless” style sending unit. I also have an equus fuel gauge laying around just in case the factory one doesn’t work.
Before I installed the sending unit I looked it over, its stamped "10-73" like it's suppose to, it's the correct length. I also wanted to test it, so I laid it on the fender and temporarily wired up the fuel gauge next to the battery. Turn the sending unit upside down to make the ball go to the top, it read full, turn it over it read empty.
Fantastic, put it in the tank, which probably has 5 gallons. hook everything up and the factory gauge doesn’t work. So get the equus gauge back out, and it's reading over 3/4 of a tank, closer to 7/8. Thinking maybe a wire is backwards I flip the wires. I think that killed the gauge. So I break out the tester, start reading ohms and I have 18ohms at the sending unit, and all the way up to the sending unit wire at the dash. if im not mistaken 10 ohms is full, so it appears to be reading backwards
Any help is greatly appreciated, because I am completely lost.
Forgot to add the swing sending unit has a broken wire and the float ball is full off gas
Before I installed the sending unit I looked it over, its stamped "10-73" like it's suppose to, it's the correct length. I also wanted to test it, so I laid it on the fender and temporarily wired up the fuel gauge next to the battery. Turn the sending unit upside down to make the ball go to the top, it read full, turn it over it read empty.
Fantastic, put it in the tank, which probably has 5 gallons. hook everything up and the factory gauge doesn’t work. So get the equus gauge back out, and it's reading over 3/4 of a tank, closer to 7/8. Thinking maybe a wire is backwards I flip the wires. I think that killed the gauge. So I break out the tester, start reading ohms and I have 18ohms at the sending unit, and all the way up to the sending unit wire at the dash. if im not mistaken 10 ohms is full, so it appears to be reading backwards
Any help is greatly appreciated, because I am completely lost.
Forgot to add the swing sending unit has a broken wire and the float ball is full off gas
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