Originally Posted by Christopher Thwaites
am completely satisfied with my van in every regard except the small fuel tank!
Aero tanks offers three different auxiliary fuel tanks for the Sprinter. One on the left side next to the OEM tank (20 gal), one on the right side near the sliding door (14 gal), and one in the OEM spare tire location (I think 26 gal, but not sure-and you have to move the spare, although it looks like yours is already on the rear). If Aero installs the side tanks themselves, they drill through the interior of the van. If you have Agile Offroad install the Aero side tanks, they sneak the pipe up into the wheel well without penetrating the van wall. Not sure where the port ends up for the spare tire location tank.
I saw a Sprinter at SMB West that was in for service. The owner had had Agile install both the left and right aux tanks, giving the rig an extra 34 gal. of fuel capacity. Several people on the forum have an Aero aux tank, usually installed by Agile. I am getting the left side tank on mine.