Carrier fuel funnel ?
 

I've had this funnel kicking around the shed for some time. It has only become of use, since I restored my carrier, and needed to refuel, - access to the tank is (in Aussie LP2/a's) under the rear seat back cusion and behind the rear seat bum cusion.
The funnel sits in position quite comfortably.
Embossed on the funnel is the " big C with arrow " G.S.W. CANADA: it doesn't lend much help refueling my Blitz, because of it's verticle throat: but suits the carrier.

A photo of the funnel in position

Re: Carrier fuel funnel ?
 

I wonder if this is for adding oil to a CMP's motor? F.Y.I. ....G.S.W. stands for General Steel Ware.

My understanding is thats exactly what the funnel was for. No reason you couldn't use it for oil or water either. On most of these funnels, you also had a threaded fitting halfway up the spout, which allowed you to attach the horsecock to it for filling up the trucks where the neck was hidden by the toolbox.
The 2 gallon POW can fits inside the funnel on the two little metal lips inside the funnel.

Amazing what you can ( no pun ) learn.
Also because the Carrier is pre - Jerry can era, I "must " start using not only 2 Gal cans, but also the 5 gal cans, the one on the ledge was made in 1942, by Simpson of Adelaide, South Australia.