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 - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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