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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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