HELP! no start after cp3 replacement - Page 2 - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 11-19-2012, 06:34 PM   eBay Motors  #11 (permalink)
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Yeah i actually had a shop check it out for me Bcz I'm busy and don't have the scan tools they do but they said they pressurized the tank and still couldn't get rail pressure over 130 psi idk if they were cranking it or not they are gunna tear into it and find out the problem
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Old 11-20-2012, 01:46 PM   eBay Motors  #12 (permalink)
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Well now I'm finishing this on my own due to shop delaying me I'm gunna double check the primer is working how would I do that? And how do I get the filter head off? And if I have air in the pump how do I get it out
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Old 11-20-2012, 03:24 PM   eBay Motors  #13 (permalink)
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You may want to consider is looking into a filter rebuild kit if it is leaking.

One other thing that can be going wrong is your injector return rates. If they are returning too much fuel it will not allow you to build up enough pressure to fire the engine over.
Also will cause low rail issues like you were seeing before you changed out your CP3.
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Old 11-21-2012, 07:06 AM   eBay Motors  #14 (permalink)
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how would i go about checking my return rates? im huessing a tech 2 scan tool which i do not have accessible right now. if there is stil air present in the fuel lines would that cause the primer not to build pressure?
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Old 11-21-2012, 08:03 AM   eBay Motors  #15 (permalink)
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It is a manual test that requires the valve covers to be removed. so you'll need to take it to a shop.

If there were air in the system or even if the filter head was leaking air it would not build pressure up.
Do you have a lift pump on the truck?
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Old 11-21-2012, 11:28 AM   eBay Motors  #16 (permalink)
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I can pull the valve covers if I have to but I don't think that's the issue Bcz like I said truck ran good before I changed the pump it just had a weak pump and threw the fuel leak code at 70 mph or so going up hills on highway driving Bcz pump couldn't keep up and no the truck is bone stock no lift pump
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Old 11-21-2012, 12:33 PM   eBay Motors  #17 (permalink)
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Hi return rates will cause the same issue.
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Old 11-21-2012, 01:55 PM   eBay Motors  #18 (permalink)
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If it is that the injectors are bad? I had all the injectors checked 2 months ago
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Old 11-21-2012, 02:09 PM   eBay Motors  #19 (permalink)
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was it doing this before you changed the injectors?
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Old 11-21-2012, 05:07 PM   eBay Motors  #20 (permalink)
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I just had a thought... If you or the shop that installed the CP3 removed the FPRV for any reason and took it apart, its very possible that the needle fell out. Your rails would return fuel almost as fast as it was being pumped. It may have somehow stuck open even if you didnt mess with it. I would do the bottle test and see what the FPRV is returning before injector return rates.
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