Today had a strange happening, driving along and fuel gauge drops to E. Then
a few miles later starts to come back a 1/4 mark at a time. I thought I had seen
this on the forum, but a search did not show it. No codes, low fuel light came on,
and then off as it climbed back up. Anyone see this before? Tank was full
at the time.

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2005 Silver Limited CRD 53,000 miles
GDE EcoTune / Trans tune
PML Differential Cover/Crankcase Mod
Tal & Hadas Grill Guard/TransGo Shift Kit
V-6 AirBox/Lunar Boost & EGT
Lund Cold Weather Grill Insert
OEM updated Filter Head, Cummins Lift Pump

You weren't rock crawling at the time were you?

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HERS:'16 WK2 Limited EcoDiesel - GDE hot
HIS: '06 Liberty CRD - EHM , GDE eco, Brite Box, Stanadyne FM100, Cummins lift pump, OME lift
'06 Dodge/Cummins - Play truck; a couple of fans, a proper cam shaft, and man handled electrons by EFILive 500/900
'01 Dodge/Cummins - Work truck; Lots of mods

Did your GDE tune include the recalibration of the fuel gauge? The first tune they released did not have that, the new one makes the fuel gauge more linear and sets your idle speed at 800 rpm in 4-Low.

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In this war of lines, so many have been crossed. Where will it all stop?

2006 Deep Beryl Green CRD Sport *SOLD 1/22/12*
Provent, V6 Airbox, Fumoto, Samcos, GDE ECO & TCM Tune, Euro JK TC, Magnaflow Catback
245/70/16 Destination A/T's
Boiler's Radiator Skid Plate
Jeepin' By Al 2.5 inch Adjust-A-Strut Lift, JBA Gen 4.5 UCA's (6/5/10)

I really think the sender in the tank may be the problem, the GDE tune I do not think
is the issue, it ran for days, its not original, so will see as the fluid level goes down
if the gauge starts working again. It is the cummins in tank unit, which I would suspect
over the tune. Have contacted them and they have had no issues, so go with the
simplest prospect, a hanging up float unit, once I get the fluid level down will drop
the tank and see. Just checking to see if any other cummins units have had the
issue.

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2005 Silver Limited CRD 53,000 miles
GDE EcoTune / Trans tune
PML Differential Cover/Crankcase Mod
Tal & Hadas Grill Guard/TransGo Shift Kit
V-6 AirBox/Lunar Boost & EGT
Lund Cold Weather Grill Insert
OEM updated Filter Head, Cummins Lift Pump

New Part number replacement now 5143160AB and the price plus shipping is 179.00 from
Mopar Parts. Once I have it will see how it compares to the one in the tank now. I was
so careful with the wiring I have ordered a new pump will see how it goes.

_________________
2005 Silver Limited CRD 53,000 miles
GDE EcoTune / Trans tune
PML Differential Cover/Crankcase Mod
Tal & Hadas Grill Guard/TransGo Shift Kit
V-6 AirBox/Lunar Boost & EGT
Lund Cold Weather Grill Insert
OEM updated Filter Head, Cummins Lift Pump