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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!!
Remove the back seat cushion, the bottom one, and the fuel pump is right there underneath. It has a panel that covers the fuel pump which youll see after you remove the back seat. Remove the panel and you will see whats leaking. Most likely either the fuel inlet, outlet or return line is leaking.
But if something is leaking you will definitely see it.
Quick way to check for fuel pump problem, If it has the 2.2L ecotec you will have to remove the black engine cover first. Simply remove your oil cap and pull easily on it until it lifts up away from the engine. with the cover off. You will see a round but long piece of metal which is your fuel rail. you will see the fuel injectors connected to the bottom of it. the is a cap on it that looks very similar to a valve stem cap for a tire. it will be on the right hand side of the fuel rail. Simply, take this cap off and push down on the inner needle of it as you turn your car over. if gas comes out strong you have a problem other than fuel pump but if it trinkles out you may want to replace your fuel pump. I would always recommend replacing the fuel filter before the pump. hope this helps
do you have an injector pump mounted to the engine block? on some the seals on the pump leak letting the fuel go into the engine. only other thing would be the standpipe maybe cracked or broken. it is probally the pump though.not seeing how it's mounted i cant help much more than this.
change fuel filler as normal then connect fuel feed from tank connect injectors leak off to fuel fillter leaving the rail flow pipe off this is the midddle one with the arrow pointing out
connect a piace of clear plastic pipe to this connection and slowly suck the fuel through the filtter and half way up pipe you can see this happen stop sucking the fuel will flow back to fillter take the pipe you were sucking through off and connect the feed to rail pipe turn on and crank engine she will start immediately