12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

problem maybe fuel, maybe timing maybe valves

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Old 12-27-2010, 02:58 AM
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Default problem maybe fuel, maybe timing maybe valves

my truck had a fuel problem when i got it, when i put it to the floor it would spit and sputter. i thought it was just the valvesso i adjusted them, that helped a little, put injectors in it( bosch 370) no difference but more power, put a lift pump in it, big difference. but still runs rough. drove about 30,000 miles and now its back. so i put the old injectors back in and adjusted the valves, that helped alot but still has a slight miss on heavy acceleration. other than that it runs fine. i think its delivery valves but havent got to get thm yet. any info or thoughts helps
 
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Old 12-27-2010, 09:40 AM
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sounds like it could be the over flow bolt. have u replaced it yet?
 
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Old 12-27-2010, 11:16 AM
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No I haven't, the banjo bolt for the supply line and return line on the top of the fuel filter housing?
 
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Old 12-27-2010, 11:50 AM
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no theres a overflow valve in your pump
 
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Old 12-27-2010, 02:47 PM
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the return line coming out of the pack of your injection pump has a banjo bolt that restricts fuel, and when they go bad, they will do what your describing
 
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Old 12-27-2010, 04:32 PM
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Old 12-27-2010, 10:38 PM
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Where can I get a new one? Cummins?
 
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Old 12-29-2010, 02:58 PM
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i had one that was doing the same thing an we advanced the timing and it ran great
 
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Old 12-29-2010, 04:03 PM
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Originally Posted by 95 12v dually
Where can I get a new one? Cummins?
yes.

Also many of our sponsors should have them

Theres also these guys:

CUMMINS - Fuel System - Tork Teknology
 
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Old 12-31-2010, 03:03 PM
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Overflow valvE didn't seem to change anything, swapped with a buddies that purs like a kitten, but it didn't change anything
 

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