This may not go through as I find out most of my answers are not added, maybe I answered too many?
I really think some of the machine are crazy. The rear tube has the adaptor on it or a coupling and the front one is smaller and has the filter on it. The rear tank tube goes to the large primer bulb inlet. the small primer outlet goes to right side of carburetor or older models upper inlet on right side. Front tank tube goes directly to carburetor on left side of lower right side. If the engine runs about 5 second and quits every time you prime it switch the two tubes on the carburetor. If it only runs a tank or two and will not start, the primer bulb may have gone bad if it will not pressure up, If it still no work, maybe it needs a carburetor kit. Make sure it has a spark. If this fails, consider a large heavy hammer. It takes patents with the new stuff. The alcohol in the gas is why everything falls apart.
pinkpanther
April 2008