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Ā· Mechsmith
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They are not taboo. The difficulties are largely the high degree of cleanliness required and since they fail pretty rarely parts aren't easily availiable.

In the last 50 years I have never had one towed in (Farm equipment) due to the injecter pump failing. My first common rail-pizeo system was in 1998. It has been towed in three times since due to the electronic control system failing.

So if you are willing to assemble the pump while it is soaked in and under kerosene and you are comfortable working in tolerances to 1/10,000" then have at it. They are pretty simple actually. The biggest single problem has been leakage from tired seals, which doesn't usually stop you. However in the electronic systems there is a lot more to go wrong.
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