Posted by athol carr on November 09, 2012 at 23:02:03 from (115.188.3.223):
In Reply to: F12 Fuel pump posted by Heath Thomas on November 09, 2012 at 19:26:55:
All the 12 series tractors had fuel pumps, IHC goofed, they did not allow enough space between the push-rods to allow the spark plugs to be put on the right-hand side of the engine. (The early Farmall A had hardly enough room until they changed the head so that you could get a normal plug spanner on the plug). As a result the spark plugs are on the left side of the engine, under the manifold (great if you need to access the plug on a hot engine). As a result an updraft carburetor as used on other IHC tractors was not possible so instead they used a downdraft carburetor which was too high on the engine for gravity feed from the tank, hence a fuel pump to get the gasoline/kerosene/distillate to the carburetor. On a straight gasoline tractor not good news if the tractor has not been used for while, the fuel in the carburetor has evaporated and you can crank for quite some time before there is enough fuel in the carburetor to start. Just did for my O-12 today, took about 15 minutes cranking before it would fire up. The kerosene/distillate O-12 or W-12 and later F-14 tractors with the starting tank in the hood were easier as they had gravity feed for starting. The earlier F-12 with the starting tank in the back of the main tank had the same difficulties as the straight gasoline tractors. There is only about a 1/2 inch head on the T junction between the carburetor pipe and the return to the tank. Most of the fuel from the pump goes straight back to the tank!
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