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Discussion Starter #1
cummins 4t390 - fuel in oil. changed mechanical pump to electric pump,,4 new injectors,,injector pump out for rebuild. could it be something else,,??
 

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If you eliminated the lift pump then likely suspect is a bad seal in the front of the injection pump. What pressure is your electric pump putting out? Is this a VE pump on the engine?
 

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pump rebuilt and installed runs great.. pump seals were hard old my have been original to machine. main shaft worn new springs two of them broken brand //thanx for your help
 
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