Are there any common reasons for this? Trying to figure out where to start checking before I get into it.

 

first, take the sender wire off the tank and ground it, the gauge should read past full, if not the sender is bad or the wire, if it reads full, then you have a issue with the gauge. I fired my IVR and have been tracing mine for over a month and its only 2 wires

 

got the same problem, which one is the sender wire

 

Found this:

http://www.mustangandfords.com/techarticles/75259/

In the FAQ of all places... the key part being the Fuel Gauge section

 

haha, there you go. That's all the info you need...and then some!

 

Is there an "easy way" to get to get to these wires?

 

What? The sending unit wire? Just crawl your butt under the gas tank and take the wire off the sending unit. Ground it on the chassis and see if the gauge pegs.

 

I'm fat LOL was hoping to dodge getting the jack out......

 

Then it's time for a diet fat boy. And, as far as getting the jack out.......now, that is just pure laziness.

 

That would be why I'm fat I'm going to go out and do it as soon as grandma gets here to watch the baby....