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Listen to BOB. I have a 64 1800 gas, which I believe is a B series. It has the USX carb and exactly as Bob described, there's a little diaphragm 'accelerator' pump inside the float bowl. Mine is shot and makes the tractor run rich even with the needles closed tight. Also, the tractor will most often refuse to 'take the gas' when you try to advance the throttle. That's because this little diaphragm is vented on one side to manifold vaccuum. When the governor opens the throttle, you lose vaccum, and the little pump is supposed to give a squirt of gas to over come the hesitation. With the bad diaphragm, it draws raw gas up the vaccuum passage and runs rich, but does not respond when you need it. You just lose vaccuum, which with an updraft carb means a sudden lean condition and the tractor stumbles or stalls. I found a replacement (but have not had time to install yet) thru a guy on ebay that calls himself "Trio-diode". Search for Oliver parts or look for that name, then give him a call. I think the problem here is confusion from calling it a 'fuel pump'. I can't speak to the 1960 models, but my 64 absolutely has a mechanical fuel pump on the side of the block to push fuel to the carb. It too is problematic, and I have yet to find a replacement diaphragm. Personally, I'd like to ditch the pump and go to a gravity feed, but a very knowledgable Oliver guy has warned me not to. So, any help locating fuel pump rebuild kit would be appreciated. Finally, consider the possibility that the tractor you are looking at is actually newer than 1960 or has had a newer carb put on it. Good luck!
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