Originally Posted by SheepShagger
Why is that?
All the ones I have seen, T into the normal filler then pump from the aux tank into the main tank with a pump that will only work when the main tank level is reading below 1/2 (or some low tank reading).
I'm thinking about one of these fuel cells:
I don't think they have an opening large enough for the largish in-tank fuel pumps required on the evaperative emissions vans. Could be wrong though.
It's sounds like you are talking about a Transfer setup. That may work. Although I was told that when using a transfer setup on the vans (at least the newer vans), the fuel gauge won't go back up to the new level until unless you restart.