2 Problems with my gas gauge...hopefully someone else has seen this.

For the last couple years I've been having a problem with my gas gauge. After filling my tank up and driving a few miles, my gauge drops to empty and my engine & gas lights come on. This only happens a couple times right after filling up. Then, after restarting the truck a few times it stops...until the next time I fill it up. I did a search and found this thread:
https://dodgeforum.com/forum/3rd-gen...e-problem.html
It suggests wiggling the wires (which I haven't done yet), but for two years the problem is consistent with ONLY a full tank and only the first few starts. If it were loose connections, I would think the problem would be more inconsistent.

The second problem, and this just started to happen...
My gauge is totally miss-calibrated. When I fill the truck, the needle doesn't move from full until I put about 80miles on the truck...then the needle starts to drop. My gas light now comes on when the gauge is at 1/4 tank. 1/4 Tank is my new empty. Weird.

Any suggestions??

Thanks!

 

For the gas guage to come on at 1/4 thats normal because mine comes on at 1/4 tank

 

When my first problem occurs, it throws two codes...P0463 and P0138. Any idea of what those are?

 

Its not normal for my truck. I bought this truck new, and from day one my gas light comes on when the needle is very near empty. Its now coming on much sooner (at 1/4 tank). I'm getting the same mileage and the same miles per tank.

 

Here is a write-up for P0463
http://www.obd-codes.com/p0463

...and P0138
http://www.obd-codes.com/p0138

This one has a few Dodge links at the bottom of the page.