The one on the right is the one that I make out of Walbro carbs and use as a smoke pump. The one on the left is the big heavy bulky one that B&B sells. It is not hard to make; all you need is a couple of pressure fittings and the drill and tap for them.

Walbro used to sell a little pump just like this for use on go karts I believe it is. The Walbro number is WEP but I just searched the Walbro site and couldn't find it. Instead, I found this: http://www.walbro.com/media/5980/FPC...%208-20-12.pdf

AV8TOR