Fuel drain-back was going to be my first guess. Places to look are hard/cracked fuel suction lines, banjo bolt washers, seals on the fuel filters, whether they be spin-on or cartridge, the hand pump and water separator if so equipped. Get the engine squeaky clean, any external leakage will be slight and difficult to see , that much harder on a dirty motor. Change the fuel filter and service the water separator if it has one. Look at every joint that is likely to have a rubber part in it. If it has any banjo bolts, pull them out and look for a tiny strainer about the size of a pencil. Knowing where this filter is may save you trouble in the future. If it has a hand primer pump, see that the plunger is screwed home right when not in use. If the leak still eludes you, buy some clear vinyl tubing and install a piece in the return line and see if the system is making air while the engine is running. If it has the original fuel hose with the braid on the outside, that stuff can look perfect from the outside but the rubber cracked and broken on the inside.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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