Fuel gauge issues

[jpatters13]

SUCCESS!! I bought the resistor I linked above from a seller on Ebay (Classic Industries part) and swapped my old one out. The gauge now works perfectly for both tanks!  Thanks so much for all of the advice and expertise!  You guys saved me a ton of headache.  This forum is awesome!

[rich weyand]

Excellent.  Thanks for letting us know.  It keeps the knowledgebase growing.

[jpatters13]

Okay...maybe I celebrated too quickly?  The resistor I bought seems to be wrong.  When the tanks are full the gauge goes way past full...like another half of a tank past full (3:00 to 4:00 position).  Any suggestions?


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[Boone83K10]

too much resistance. an open ground is infinite ohms so the resistor is allowing and/or adding more resistance than the 0-90 the gauge is set for.

[jpatters13]

Can you recommend a course of action to locate and eliminate the problem?


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[jpatters13]

Are you saying that there is a ground that is not good which is causing infinite resistance? i noticed that the gauge seems to read correctly when the truck is off but as soon as the power is on it dives to the right.


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[Boone83K10]

Going further than full, to say the 3 o'clock position, is an open circuit on the ground side. Check the ground connection on top off the tank.this will be a push on post style connector, then follow that wire to the frame, check that. Then make sure the pink wire from tank/fuel selector valve if you have dual tanks, is not broken. Check ground side of resistor and then check ground pin on gauge. Any bad connection will result in going past full.

 

[bd]

Can you recommend a course of action to locate and eliminate the problem?

You need to determine whether the symptoms originate from the dash gauge, the sender, or the wiring...

If the prior posts haven't lead you to a solution, disconnect the fuel gauge wire from the tank sender and substitute the 90-ohm resistor as you did before between the pink wire and a good clean ground.  Switch the ignition ON.  Does the fuel gauge indicate exactly Full?