you could have some fluid leaking back into the pump assembly

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"NEW" 1984 300D TD needs some love

How might that happen?

Have you ever used a floor jack and had it leak down when the car was on the jack? could also have some cavitation that is settling out but i think that is less likely, also part of the load does go back through the return lines, is there any diesel showing up there? i think it moves that fuel right as injector closes.

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"NEW" 1984 300D TD needs some love