AlphaOBD and DTE correction for 51 gal Tank Mod

[Bigdaddy]

I put in the S&B 52 gallon tank and the Fleece in tank pump. I also swapped to the Black Market Performance spin-on fuel filters/separators.

I’ve got a OBDLinkMX+ Bluetooth plug and hopefully it’ll work for programming.

Have you try it yet I had a 52gals titan fuel install and I'm looking to change it?

 

[18RamBH]

Walt - I installed the Titan 44 Gallon Tank in my 2018 Ram 3500. Using AlfaOBD, I changed the VehConfig 3: Fuel Capacity value from 121.000 to 194.000 based on some of the things I read. (My fuel tank is completely full) After making the Tank Capacity change, the fuel gauge dropped to slightly below 3/4. I also tried the change with ECUConfig 4: Fuel Capacity (it was by default 000.000) - I changed it to 194.000 also. No change.

I then changed the values back to stock and the fuel gauge went back to full.

It seems to me that there is a reset or something needed? Just changing the Tank Capacity value seems to cause the computer controlling the fuel gauge to think the same voltage from the fuel sender when it was 121.000L equates to slightly below 3/4 of a tank when the capacity is set to 194.000L.

I'm not sure what to try? Disconnecting the batteries after the change?

Did you get this figured out? My truck is doing the same thing after setting the capacity in both places to 194L. Thanks

 

[photo nomad]

Did you get this figured out? My truck is doing the same thing after setting the capacity in both places to 194L. Thanks

Has anyone solved this issue? Just put a Titan 52g in my 2018 Ram 2500, and when I change the tank volume to 194L mine also drops below 3/4 of a tank even though it is completely full.

 

[Richierich84]

Has anyone solved this issue? Just put a Titan 52g in my 2018 Ram 2500, and when I change the tank volume to 194L mine also drops below 3/4 of a tank even though it is completely full.

I also now have this issue and have seen others not experience it. Any help?

 

[Cporche]

I installed my s&b tank yesterday. after researching i had a feeling i wouldnt be able to get anywhere where the dte. I have the same issue aswell, literally any number over 121 liters and i start coming off of the full line. The DTE never changes. I will probably play around with it more this weekend and see if i can play with some of the level readings after increasing to the 194liter (from other forums this is the highest that can be used.)

 

[kirk35]

I'm about to try this myself on my '22 2500 CCSB (but my expectations are very low). I installed the Titan 52 gallon tank last weekend.

On my first fill-up with the Titan installed I used HPTuners to read the fuel level sending unit voltage as I filled, taking readings every 5 gallons at the pump. At 40 gallons the sending unit voltage stopped changing. I believe it is at it's mechanical limit at that point. The Titan tank is significantly taller than the factory tank and the sending unit just isn't designed for that extra height.

I made this chart up to show the sending unit voltage as I filled and compare gauge readings to actual fuel level. Tank geometry really screws with the readings. Between 15-20 gallons gauge goes from 5/16 to 5/8 of a tank.



I would assume that this will be the same (or close) for anyone going from the 31 to 52 gallon tank. This picture shows the two tanks side by side, you can see how deep the sending unit is recessed in the new tank. I don't know of any way to make the gauge read correctly, all the programming in the world can't change the physical limitations of the sending unit.

 

[kirk35]

I thought I'd update my progress so far. I've had the 52 gallon Titan installed for about 6 weeks now and have run a couple of tanks through it. I filled up today and decided to give AlfaOBD a try.
I changed "VehConfig 3: Fuel Capacity (36-290L)" from 117 to 194 Liters. No other changes were made. DTE increased to 883 miles and the gauge stayed on Full. I'll run through this tank and see how the gauge responds, but I'm going to take the win on the DTE.

 

[RedSRT4Me]

I installed my s&b tank yesterday. after researching i had a feeling i wouldnt be able to get anywhere where the dte. I have the same issue aswell, literally any number over 121 liters and i start coming off of the full line. The DTE never changes. I will probably play around with it more this weekend and see if i can play with some of the level readings after increasing to the 194liter (from other forums this is the highest that can be used.)

If you change the tank capacity to what it actually is the fuel level will drop. It's a function of the calculations. How far are you guys driving the trucks after making the change?

Realize we own adaptive computerized vehicles. The truck has to have time to learn the changes given just like we do. The magic number required is in the programming for adaptive capabilities to be complete

 

[rtrthebear]

I am new to the forum and have been reading through the pages here. I am wanting to upgrade my fuel tank to the S&B 52 gallon. I am wondering if anyone has figured out the AlfaOBD in correcting the DTE and does the fuel gauge read correctly? Should you keep the original diesel sending unit or by an aftermarket? Does that change correct the gauge? Thank you in advance for help. I hope I posted this in the correct place.

 

[6thGenMariner]

Double post