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cummins 8.3 engine with CAPS pump getting fuel in crankcase
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ryank
Posted 6/23/2022 20:39 (#9718322 - in reply to #9718135)
Subject: RE: cummins 8.3 engine with CAPS pump getting fuel in crankcase


SE Nebraska
You've got 1 of 2 issues. 1) there are little downtubes that go from the injector line to the injector itself. One could have cracked. That's gonna be a little difficult to diagnose. You could try running some fluoro dye in your diesel and running the engine with the valve cover removed. You obviously have a massive leak so if you're going to see it, it should surface quickly.

2) the pump itself is leaking. Could be the shaft seal, could be the accumulator part of the pump. Really the only way to know if pump is leaking is to have a good pump shop run it on a test stand.
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