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1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

how much pressure should a piston lift pump have?

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Old 01-29-2010, 03:06 PM
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Default how much pressure should a piston lift pump have?
how much should the low pressure piston lift pump be putting out at minimum?
 
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Old 01-29-2010, 03:11 PM
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They should put out 18psi, I think RichieO has sadi his doen more like 13 to 15 psi after the filter.
 
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Old 01-29-2010, 03:18 PM
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ya what rs says but now i cant remember where i read that
 
Last edited by ArizonaRedneck; 01-29-2010 at 03:22 PM.
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Old 01-29-2010, 03:25 PM
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ok. thanks. another member has them in stock and said they were form8-10 psi for $50. thought sounded a little low psi. would that be enough to fuel 350-400hp? of should i get the napa one for $150?
 
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Old 01-29-2010, 03:49 PM
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if you plan on gettin big power like that, id look into an airdog or fass or something. but thats just my 2 cents
 
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Old 01-29-2010, 03:57 PM
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id love to go that way if i had the funding. it was alot cheaper to just go with the piston pump
 
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Old 01-29-2010, 04:12 PM
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Ive never had one rune over 8psi new or old(after the filter)
 
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Old 01-29-2010, 05:34 PM
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Originally Posted by stillcummin
Ive never had one rune over 8psi new or old(after the filter)
you are thinking of the diaphragm pump that comes stock, the piston lift pump is on 2nd gen 12v's and the Low pressure piston pump is from industrial/agricultural set-ups
 
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Old 01-29-2010, 05:42 PM
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I see 12 to 13 psi after the filter and have seen 3 psi wide open. Thats at 300 hp tune. PToombs see's 14 to 15 with his but he runs a bigger fuel filter then stock.
 
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Old 01-29-2010, 05:55 PM
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so the stock one for a 94/98 from kragen auto parts is the high pressure one? i guess ill have to go through cummins to get the low pressure one?
 
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