Fuel gauge reads 3/4 full when tank is full ???

[351c4v71]

My fuel gauge reads 3/4 full when tank is full
Where do I start the testing??
Thanks

[blown motor]

Mine does the same thing. I know my gas tank was replaced. Not sure if that has something to do with it. Looking forward to the answers.

[4Cruizn]

I think you will need to pull the tank and adjust the float on the sending unit until it reads full. 

[farmboy70]

IF the sending unit is a repop, they are calibrated wrong for Mopars.
The ohms are wrong for Mopar gauges.
Dave

[mopardave]

I have heard adding 50 ohm resister is the fix,

[351c4v71]

Mopardave,
How do I go about doing that exactely?
I know next to nothing about electrical.

[brads70]

Mopardave,
How do I go about doing that exactely?
I know next to nothing about electrical.

  me too?

[Chryco Psycho]

put a 50 ohm resistor in line between the guage & sender , should cost less than $.25 at an electronocs store , if 50 ohm is correct sounds high to me but it might work OK

[HP_Cuda]

Was going to say head to digikey but here is one that should be close to everyone:

http://www.radioshack.com/product/index.jsp?productId=2062292

Or if you are good enough you can make your own - might take a bit of time to get the correct length of wire.

[dutch]

could be you float as well. They often leak and fill with gas

[mopardave]

as CHRYCO said, in line. i personally have not , but it makes sense. I got this info from a customer.

[MEK-Dangerfield]

as CHRYCO said, in line. i personally have not , but it makes sense. I got this info from a customer.

Dave,

  I'm not following the logic here.

If you short the blue wire from the sending unit to ground, the gauge will read full. Adding a resistor will only make it more inaccurate in this case.

The standard Mopar sending unit measures about 12 Ohms full, and 70 Ohms empty.

I would suggest trying to bend the arm with the float of your sending unit downward a bit.   

[Jamiez]

If you do add a resistor, I'd recommend adding a variable one or a potentiometer.  They are more expensive but it would allow you to tune it have the gauge read exactly what you want.