1/4 tank limp mode?

[KBecker443]

Hey guys on my 99 24V when ever my tank gets to 1/4 tank my truck goes into a lim mode, truck will still tell me I have X amount of miles until empty. Won’t leave 1st gear or exceed 20MPH. I think it’s something todo with the sending unit but really not sure any help is greatly appreciated 

[Silverdodge]

Never heard of that in a second gen

[dripley]

Have you checked for codes when it happens? It does seem strange.

[KBecker443]

I haven’t gotten an engine code since I’ve owned the truck. It does it every time I hit 1/4 tank 

[Dieselfuture]

Are you sure you're not sucking air

[KBecker443]

I don’t think so, 34 gallon tank and only takes 24 to fill it up. 

[dripley]

I have to assume the problem goes away after you fill it up?

[KBecker443]

Yes fill it up and truck runs good again shifts fine and runs like it should 

[Silverdodge]

Do u have a draw straw? Also is it running like crap or idles revs normal

Edited March 25, 2018 by Silverdodge

[KBecker443]

Yes but had this issue before the draw straw was installed 

[Silverdodge]

Like I say does it run normal or like crap

[KBecker443]

Fires up fine, idles fine and drives up to 15-20 mph then won’t leave 1st gear

[IBMobile]

The only thing the transmission and fuel sender/gauge have in common is the PCM.   

[Mopar1973Man]

I've seen one case where a transmission shop installed a voltage regulator for the transmission wrong. Instead of tapping the power wire they cut it to the PCM which caused all kinds of weird issues. I know modified transmission typically have either a resistor or a voltage regulator install for the governor pressure sensor.