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

what should my fuel pressure be at on my truck?... JOIN NOW TO REMOVE TRACER

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  #1  
Old 01-04-2010, 12:53 PM
jake 94's Avatar
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Default fuel pressure
what should my fuel pressure be at on my truck?
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Old 01-04-2010, 01:14 PM
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stock.....17psi at idle and 30 or so while cruising. With your mods....40psi would be a good number to look for but you'll have to shim the OFV spring or go to an aftermarket pump like a FASS or Airdog.
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Old 01-05-2010, 07:26 AM
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My truck would run with 2-9 psi before I removed that junk a$$ lift pump and replaced it with a real one. I drove it a long time w/ that low pressure.
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Old 01-05-2010, 07:40 AM
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Originally Posted by STUMPMAN View Post
My truck would run with 2-9 psi before I removed that junk a$$ lift pump and replaced it with a real one. I drove it a long time w/ that low pressure.
Wow i am suprised it ran with those low numbers. With a p-pump higher flow is better, if or when you get a different pump, dont be shy to look at something that puts out 40-50 psi, those p-pumps love high fuel pressure delivery especialy when modded.
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