in the where's your lift pump thread I put a little piece which is an extract from the kj crd manual referring to fuel sender and how it works. somewhere around page 27. It might help you fault find.
http://www.lostjeeps.com/forum/phpBB3/vie ... 862#328862
Not sure about what the problem is for you,
1) is your battery voltage correct?
2) wonder if your float at the sender (in tank) is not floating properly
Im sure someone will have a few more suggestions.
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KJ CRD 2.8L AUTO 2007
BP ULTIMATE
Extra Transmission cooler
2.5 inch full flow muffler.
Fuel Heater Disconnected.
In tank lift pump

Provent

Boost, EGT and Trans temp.
Engine Bay Vents soon.
Transgo Valve body (no resistor)

Hemi TC P04736587AC replaced (original TC P04736582AD in '07 KJ CRD) - Nice -:)

If im not here Im there....