Failure of the plastic weight retainer inside is common and happens over time, regardess of engine hours. Stanaydyne/Roosamaster eliminated it in 1985 with a newer style.
When it fails, little pieces get stuck in the fuel return circuit, pump housing overpressurizes, and engine quits.
Once off, it takes an hour to take the pump all part, fix, and put back together. I had to do many, on site, from the back of a service vehicle. No fuel adjustments have to be touched, so calibration is not an issue.
Total parts cost is usually around $25. For an extra $45, you can upgrade an eliminate the plastic forever. Otherwise, expect it to last 10-15 years. Send it to a shop and expect to pay $300 to $600 just to have those $25 worth of parts installed.
One note though. That pump has a "fused" driveshaft that is designed to snap in two if the pump turns too hard. So, you'd better check and make sure the pump is actually turning. Easy to check by looking into the timing-window.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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