Another option for getting a radiator is going through a decent forklift shop and seeing what they can find aftermarket. But I will warn ya, my employer uses lots of aftermarket parts and while they are a very close match, they often times are no an exact match, but with a radiator, I am sure you can make it work if its not perfect. Like hyster gareth said, there is typically on an older forklift two propane components side by side, the first one being a vacuum operated fuel lock out valve and then the vaporizer. The fuel lock out is operating through small vacuum lines going to the carburetor/intake manifold and as vacuum is created through the engine spinning over, the fuel lock out opens and sends propane to the vaporizer. With 100% honest advise, if you are investing a little money into the forklift, ya might want to go just a tad bit further. Here is my honest advice, replace the fuel lock out with either a new one, or my preference, an electric shut off solenoid. The electric ones are very simple to wire up and have the advantage of doing away with all the small vacuum lines, therefore you wont have to replace them. The electric solenoid is $51 and is more reliable. Plus it makes a "click" noise when it operates so you know very easily of its working or not. Also, I would clean the carburetor and change the plunger kit in it. The kits is around $50 and will give you years of reliable service. Replacing these two items along with the vaporizer would pretty much be giving you an entirely new fuel system. As mentioned, the black tar looking residue in the fuel system is parafin oil residue that builds up over years from unclean propane. If ya don't find much, then that means who ever is supplying your propane is doing their job of draining their bulk tanks. As for the brass doo-hicky, I believe what you are looking at is the quick fill connector that is mounted near the tank. It is brass and is just there as a handy way to refill the tank without having to take it off, nothing more.
