Changing Tank Size in Computer
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Freshman User
Joined: Jul 2004
Posts: 28
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From: TX
Changing Tank Size in Computer
Am interested in having a 46 gallon Transfer Flow tank installed as a replacement in a 05 F-250 diesel short bed, 4x4. The TF website only has trip computer reprogramming instructions for 2002 and older trucks. Has anyone come up with a way to change the tank size programmed into the computer so that the miles to empty is based on the larger than stock tank size (46 vs 29)?
Last posts I saw on this subject were from July or thereabouts.
Last posts I saw on this subject were from July or thereabouts.
Senior User
Joined: Mar 2004
Posts: 394
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From: s.f. bay area
Well, I was probably one of those july or so posts looking to do the same thing. The only thing I think you (we) can hope for is to trick the computer into thinking we have the larger (long bed 38 gallon) tank. That is at least closer to 46 then the 29 was. I saw on this site posted a wiring diagram for the connector on the overhead console, and it has pin 16 listed as "Fuel Tank Selector Signal". I was hoping this was tied off to one of two values depending on whether it was a long or short bed. So far I haven't gotten anywhere finguring out where this signal comes from or goes to. I (we) need someone with access to a wiring diagram to trace this out. Good Luck, if I manage to find out anything, I'll be doing a post.
New User
Joined: Oct 2004
Posts: 23
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From: OC, CA
I was talking to a company here in So Cal and they (Arrowtank) make a 55 gallon tank for the short bed F 250/350. They claim that everything will read FULL for about the first 200 miles on their tank then for the last half of the tank the computer will operate as it does now. Everything being as accurate as it is now. The computer will not read the top half of the tank.
This is just what they said... It still think I am going to do this.
This is just what they said... It still think I am going to do this.
Senior User
Joined: Mar 2004
Posts: 394
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From: s.f. bay area
The only way the DTE will work properly is if the overhead knows the relationship between the float level and the remaining gas. For a new tank to display the same DTE as the factory tank, the new tank would have to be shaped such that the verticle movement of the float per gallon is the same as the factory tank. To me, this implies that the volume of the tank as expressed as a number of gallons/height needs to be the same as the factory. If you think about it, the tank couldn't have a larger footprint then the factory. It could have the same footprint, but just be taller. If this is the way their 55 gallon tank is, then they are correct, they just need to install the float such that it reads the same amount as the tank gets to the empty level.
I know my Transfer Flow 45 gallon tank is longer then the factory, and higher also. The width seems to be about the same. Since the footprint is bigger, there is no way that the verticle motion of the float will correspond to the same amount of fuel being drawn down, hence the DTE never really works. I do intend on readjusting the float so that it reads the lower part of the tank better, as now when the fuel light comes on, there is still more then 10 gallons in the tank. I need to bend the float rod down a bit to fix this.
I know my Transfer Flow 45 gallon tank is longer then the factory, and higher also. The width seems to be about the same. Since the footprint is bigger, there is no way that the verticle motion of the float will correspond to the same amount of fuel being drawn down, hence the DTE never really works. I do intend on readjusting the float so that it reads the lower part of the tank better, as now when the fuel light comes on, there is still more then 10 gallons in the tank. I need to bend the float rod down a bit to fix this.
