Fuel Gauge issues

[raycebickel]

I have a 91 ranger 3.0. Fuel gauge has never worked right. The issues seem completely random. When I first start the truck, the gauge can be from pegged full to pegged empty and anywhere in between. If the gauge shows anything but pegged empty at start up, I can watch it slowly drop to pegged empty. The sending unit is brand new. Any ideas?

 

[JerryC]

Get an ohm reading on the gauge wires, check that against the factory spec. Start at the tank and move forward until you find the fault.
Did you test the new unit before you installed it?

 

[raycebickel]

Get an ohm reading on the gauge wires, check that against the factory spec. Start at the tank and move forward until you find the fault.
Did you test the new unit before you installed it?

I did not test the new unit.

 

[JerryC]

Ok, do you have the old unit so that you can test it?

 

[RonD]

Its the anti-slosh module in the back side of dash board(instrument cluster)

This module prevents the gas gauge from going up and down when you go around a corner, as the gasoline "sloshes around" in the gas tank

You need to pull out the cluster, and you will see the anti-slosh module, you can replace it with one from a junk yard, most Fords used the same module so doesn't have to be Ranger
Or by pass it

Video here:

You should also replace the 6 back lights in the cluster at this time, they are not expensive