I currently have an issue with losing power to my instrument cluster intermittently. I've changed batteries. Sometimes after starting, idle is fine, but when I try to apply gas, i get the jerking feeling I'm about to run out of fuel, but I know I have about 1/2 tank. And at moment, power to dashboard is out. Instrument cluster, computer, fuel pump, injectors, FICM (again?), something else?

 

Is the fuel tank filler cap vented correctly?

 

It's the original factory installed cap. Last week the problem finally threw 2 codes. 1) communication failure to instrument cluster. 2)low fuel sensor - and I had 3/8 - 1/2 tank at the time.
Possibility is the communication failure threw the low fuel code. I have appointment Wednesday

 

It is possible the instrument cluster has a problem, not uncommon.
Since the cluster is part of the network very likely resulting in communication failure.

 

That's what I read somewhere. My truck is a 2006. An article said instrument cluster problems were common from 2005-2007 in the 250's, 350's, trucks, vans and expeditions

 

I sent my cluster off to Circuitboard Medics got it back installed it and I got the same issue as before. Runs fine then click all the gages peg and then nothing. Any ideas?

 

If possible, see if you can have the computer checked for any codes.

In the process of doing that , if the system will not or not allow the network to communicate there may be a problem in the instrument cluster or one of the other modules thereby blocking communication. Other than checking for loose /corroded connections a good scan tool will be required to get deeper into the system.
Are there any "add on" items on this vehicle?