This is a 1 liter setup petrol tank from Bigplanes an a felt clunk I had put aside from another project.
I found the clunk would easily wrap around on itself and the filler tube so I added the brass tube and a felt pickup to eliminate air draw.
I'm making up a small mounting plate for the tank on the accessory tray and will strap it down with velcro. It's handy the tank is nice and clear can spot any issues before they become bigger issues when out flying!