Posted by RichSiri on June 06, 2021 at 06:53:18 from (174.247.15.144):
I have recently purchased a mid 80s JD 750. A little history is that I bought it off of a friend and the fuel filters have probably never been changed and theres a leak in the gas cap that has allowed water to enter tank for who knows how long. Runs great for 20 minutes and then has misfire and power loss with light blue smoke. Tractor is not running hot or using coolant so Ive ruled out head gasket for now. Drained tank, cleaned, fresh diesel , and fuel treatment. Took injectors out, cleaned and put back in. I noticed that there is no fuel recirculating from the injectors to the tank. My thought is that everything is good until the injectors get too hot due to no fuel circulating to keep them cool, hence causing fuel starvation and poor running. My thought is the injector pump is weak due to poor previous maintenance not producing enough pressure to recirculate fuel. Any thoughts before I try replacing the injector pump?
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