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If you removed your injector lines, and then reattached them. You first off got air in the line and you will have to purge them. But, I believe that your injector gasket was probably the culprit and why it was leaking. It sounds like the injector was losing fuel pressure and the pump was unable the push enough fuel to all the cylinders when under load.
If it were me, I would go online to HoyteTractors.com they carry every part for your Yanmar tractor that you will ever need. They also have a tech department too. Since you already have air in your lines, you might as well replace the fuel filter and O-ring and injectors seals. You can also get a service manual from Hoyte for your specific tractor model. If your Yanmar (3000) is like mine, my fuel pump is on the "passenger side" of the tractor and it has a bleed valve on it. So after you replace your parts you can bleed the air out. They are very simple machines to work on. Just in case you didnt know, most Yanmar tractors are a direct cross to John Deere Tractor Models. Any John Deere tractor under 100hp is/was Mfg. by Yanmar for 30-40 yrs or so. Good Luck!!
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