Hi Rod There were two different starting aids for the super 90s The one you have should have a small "starter reserve tank" on the other side of the fuel tank. Right where the return line goes back into the fuel tank. I understand that when you turned the key backward to "Start Aid" it would pump in extra fuel and heat it at the glow plug you have. We have one with this attachment and it went crazy on us once. When you started the tractor at any time. The tractor would roar away for about 5 seconds then idle back to normal. Took us a while to figure that one out. We just removed the whole aparatus and plugged the holes. The other starting aid had an either injection port on the right side of the steering console. An aluminum pipe with a screw off cover. You just sprayed some either in while starting. The air intake would suck it through a pipe to the same hole in the intake where your glow plug is. They didnt have the glow plug for this option of course.
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