24 Valve 2nd Gen Dodge Cummins 98.5-02 Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps
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Raptor pump going down to 6psi at wot

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  #1  
Old 12-21-2014, 09:02 AM
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Default Raptor pump going down to 6psi at wot

New injector pump so I thought I would get a good lift pump, The truck is completely stock and the raptor can not keep up, I just installed gauges in the truck and I'm not happy because I put on about 3k miles like this, I tow about 20k every day
 
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Old 12-21-2014, 10:08 AM
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There's a pressure adjustment screw on the pump. Have you turned it up?
What pressures are you seeing?
 

Last edited by yjay; 12-21-2014 at 10:15 AM.
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Old 12-21-2014, 10:23 AM
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I'm going to try messing with that today, I'm seeing 15 psi with the key on 13 at idle 10 going down the road empty and 6-8 towing
 
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Old 12-21-2014, 10:38 AM
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Mine idles at 18/19. I'd start there.
 
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Old 12-21-2014, 10:39 AM
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I was so upset because I thought I could just put that pump on and not have to worry about the vp44 starving,
And I did just change the filter so I know there's no restrictions there
 
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Old 12-21-2014, 10:49 AM
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Mine was set correctly from the factory, but they do strongly suggest a fuel pressure gauge to verify the setting.
You're probably fine. My injector pump lived for over 200k miles with the stock lift pump towing a gooseneck and you know the pressure was way below 10 psi many, many times. The only reason it finally gave up was the fact that it was run out of fuel, killed the lift pump, and subsequently the IP. I wouldn't sweat it at all.
 
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Old 12-21-2014, 12:19 PM
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That makes me feel better, I'm going to try bump up the pressure today, I'm going to put about 500 miles tomorrow
 
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Old 12-21-2014, 01:24 PM
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Update, I adjusted the regulator on the pump, now I am 21psi with the key on, 17psi at idle and 14 at wot.
The truck runs a lot better now, the injector rattle seems a lot more even at higher rpm's
 
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