Need fuel gauge help, very confused

[Big Block Bill]

Originally Posted by SS427

Nope. Gauge functions perfectly normal when attached to the sending wire, beyond full when disconnected and beyond full when grounded. I drained 1/4 of the fuel out and gauge read accordingly so since it works perfectly when connected I just have to live with it in my head.

Hey Rick, I think you meant to say it reads beyond empty when grounded, no? That's the way I always tested a dash unit and wiring going to the sending unit /tank. Bill

[SS427]

Originally Posted by Big Block Bill

Hey Rick, I think you meant to say it reads beyond empty when grounded, no? That's the way I always tested a dash unit and wiring going to the sending unit /tank. Bill

Nope, that's the issue. It buries the gauge past full when I disconnect the sending wire (which is the way it should act) as well as when I ground the intermediate harness to sender lead using two different ground wires (both tested for continuity) and multiple ground locations to insure a good ground. Technically this cannot happen......but it is! Grounding the sending wire should give you an empty reading as you stated but it does not.

[thehornworks]

Call Mike at Instrument Specialties. He's a good guy and should have the answer.