DuallyDean
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- Dec 31, 2020
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I just joined this site looking for some info on AlfaOBD, but my truck is a 2018 3500 chassis/cab. If that makes me too old, please accept my apologies and an admin can get rid of this post.
I recently purchased the 2018 3500 chassis cab (Regular cab, 60" CA) and intend on constructing a 5th wheel hauler bed using wrecker body sides. This requires shortening the framerails behind the rear spring hangers and the elimination or modification of the 52 gallon fuel tank that sits aft of axle. If I eliminate it, one option is to buy a midship tank from Titan or Transfer Flow but neither manufacturer offers one with the same capacity. If I modify/construct a rear tank it, it will have a smaller capacity. On other forums, it appears no one has been successful in reprogramming the BCM to a different tank capacity so that the Distance to Empty calculation is reasonably accurate. On this site at least a couple people seem to indicate they were successful, but I note that they are working with 2019 or 2020 model year trucks. I also note that the posts on other sites are older than here, so I am wondering if how to successfully reprogram tank capacity is a recent "discovery" or if it is the result of OEM software changes from 2018 to 2019? Can anyone shed any light on this?
I actually did some bench testing of the fuel level sender, and the response is fairly linear (checking gauge reading at 1" travel increments, and verifying the DTE calculation at each point). So, a tank of equal volume to OEM with a consistent cross-section throughout it's height would still return relatively accurate calculations even if the overall shape of the tank was changed from a cube (stock rear tank) to a long rectangular shape (midship tank). The problem is I may not have enough room to make a tank that fits the available space that would hold 52 gallons; and as previously mentioned, no aftermarket tanks are that size either.
Hence, my extreme interest in finding out for sure if a 2018 can be reprogrammed for a different tank size. Thanks in advance for any info.
I recently purchased the 2018 3500 chassis cab (Regular cab, 60" CA) and intend on constructing a 5th wheel hauler bed using wrecker body sides. This requires shortening the framerails behind the rear spring hangers and the elimination or modification of the 52 gallon fuel tank that sits aft of axle. If I eliminate it, one option is to buy a midship tank from Titan or Transfer Flow but neither manufacturer offers one with the same capacity. If I modify/construct a rear tank it, it will have a smaller capacity. On other forums, it appears no one has been successful in reprogramming the BCM to a different tank capacity so that the Distance to Empty calculation is reasonably accurate. On this site at least a couple people seem to indicate they were successful, but I note that they are working with 2019 or 2020 model year trucks. I also note that the posts on other sites are older than here, so I am wondering if how to successfully reprogram tank capacity is a recent "discovery" or if it is the result of OEM software changes from 2018 to 2019? Can anyone shed any light on this?
I actually did some bench testing of the fuel level sender, and the response is fairly linear (checking gauge reading at 1" travel increments, and verifying the DTE calculation at each point). So, a tank of equal volume to OEM with a consistent cross-section throughout it's height would still return relatively accurate calculations even if the overall shape of the tank was changed from a cube (stock rear tank) to a long rectangular shape (midship tank). The problem is I may not have enough room to make a tank that fits the available space that would hold 52 gallons; and as previously mentioned, no aftermarket tanks are that size either.
Hence, my extreme interest in finding out for sure if a 2018 can be reprogrammed for a different tank size. Thanks in advance for any info.
I replaced it with a loaded 2018 Rebel 1500 as my daily driver. The 2018 Chassis Cab is going to take over towing duties from the 94 dually.