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I have a new injection pump on my 01 Cummins and today the pressure @ WOT was between 7 and 10. What would make it go that low? :confused013:The filters are good too!
 

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the size of the fuel lines makes a big difference in fuel pressure. Also the location of the lift pump (frame or engine). There could be something in your fuel lines restricting fuel flow as well.
 

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Clarify what and where that FASS pusher pump is. My ddrp will suck way down like that too...
 
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