fuel problems

373mps

New User
I have a 4020 started running sluggish , changed fuel filter (glass jar type) . engine starts but will not run . checked and rebled primary fuel system. days later I went to try and start engine no change,but engine oil dipstick is overfilled?could injector pump be leaking in crankcase?
 
Injection pump may need repair, test by running with the 2 screw timing cover loose if pump is DB or JDB model. If it runs better the retainer ring is failing, causing higher housing pressure. Will cause low power or shutdown, and can force fuel past shaft seals into crankcase.
 

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