Motorcycle guys use RotoPax for additional fuel. Smaller, but are made to be attached. 

Stephen

Mobile

> On Jun 7, 2020, at 11:00 AM, Alex MeVay <alex@MEVAY.ORG> wrote:
> 
> If you have a 2wd, for a pretty slick solution, but more of a project,
> the ingenious PO of my van had added a second tank above the
> transmission.  I'm pretty sure it's this one, 6.5 gallons:
> 
> https://www.speedwaymotors.com/Black-Poly-Fuel-Tank-6-1-2-Gallon-8-x-30-Inch,5404.html
> 
> A second fuel pump fills it from the main tank (~5 min), and a valve
> lets it drain back by gravity (~1hr).  I upgraded the valve to a
> solenoid, so now it's all controlled by a single toggle switch from
> the dash.  No vapors, no leaks, hidden, >400 mile range if you're just
> cruisin' on back roads.  Further details upon request.
> 
> I was sort of wondering...I believe the syncro fuel tank occupies this
> same position above the transmission.  Has anyone fitted a syncro tank
> to a 2wd for massive fuel capacity?
> 
> Alex