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Old 04-15-2014, 02:08 PM   #51 (permalink)
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It might be stock..... but it should be pretty hard to see that much psi without a pressure box added

The higher the psi the more likelihood those injectors will crack or fail

What gauge do you have or how are you getting these rp numbers?
Stock tuning will command 26kpsi at WOT or heavy load, the stock injectors are more than capable of taking it, some guys have gone up to 30kpsi with tuning without issues (not recommended). Hell the LML engine runs up to 30kpsi stock. My LMM will run 26kpsi under heavy load, If you can't maintain that under WOT you have either a weak CP3, a FPRV that is popping and dumping your rail pressure or you have a restriction between the tank and the injection pump. The fact that it only does it cold is leading me to believe that it's not a collapsed fuel line. What are your idle pressures like (should be 6kpsi cold and right around 4.3kpsi at operating temp)
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Old 04-25-2014, 05:42 PM   #52 (permalink)
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Well, it's been at Merchant Automotive all week. Got the call today they figured it out. When they took the fuel filter adapter off and put the stock fuel filter back on it, they didn't put the check ball and spring back in. They put those in and all is well now.

That stupid adapter was nothing but a pain in the ass since day one. I lost so much time screwing around chasing problems all caused by that thing. Big regret ever putting it on.

Pretty happy I didn't have to pay for a lift pump or a CP3.
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Old 04-25-2014, 07:07 PM   #53 (permalink)
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I didn't go back and search: which adaptor was it?

A lift pump helps with everything.
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Old 04-25-2014, 07:10 PM   #54 (permalink)
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Nicktane tells you to take the check ball and spring out. It's out on mine and no problems
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Old 04-25-2014, 08:21 PM   #55 (permalink)
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Fuel filter adapter for what?
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Old 04-26-2014, 05:04 AM   #56 (permalink)
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I didn't go back and search: which adaptor was it?

A lift pump helps with everything.
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Old 04-26-2014, 05:04 AM   #57 (permalink)
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Fuel filter adapter for what?
So you can run a better, cheaper filter.

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Old 04-29-2014, 03:37 AM   #58 (permalink)
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Is NOT fixed. I took their word that it was, but it's not. They said they tested it several times and it was fine, but that's hard to believe because I have never had a problem making it act up. Did it twice yesterday and once today. This morning it dropped all the way to 4K FRP and I got a P0087 before I was at 60 MPH. UGH!
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Old 04-29-2014, 06:28 AM   #59 (permalink)
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Well, I'm breaking down and have a Kennedy lift pump on the way to install this weekend. It is a lot more desirable to me than the other two big brands on the market for several reasons.

Hopefully this cures it for good. We'll see soon enough.
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Old 04-29-2014, 07:05 AM   #60 (permalink)
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I'm almost wondering if it isn't sealing against the filter head. Either way, I think a lift pump will fix it, or expose where you're sucking air into the system
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Old 04-29-2014, 07:08 AM   #61 (permalink)
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Either way, I think a lift pump will fix it, or expose where you're sucking air into the system
Agreed.
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Old 04-29-2014, 08:26 AM   #62 (permalink)
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I am surprised, I have heard nothing but good things from Merchant Auto
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Old 04-29-2014, 08:51 AM   #63 (permalink)
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I don't want to knock Merchant. They are good shop and good people. They said they replicated the issue, put the ball and spring back in, then the issue never came back after multiple tests. Kinda hard to believe since every time I tried it since I got it back it has dropped FRP. But I am not calling them liars. It costs me a lot money and schedule juggling to leave it with them for a whole week. I need my truck now so I it's not going back to them.

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Old 04-29-2014, 09:00 AM   #64 (permalink)
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so what kind of testing did they do? return rate? does the truck have any smoke, or a miss when it drops rail pressure? could indicate a sticking injector

ive never seen this on a duramax however I have had similar things happen on 5.2 Isuzu's
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Old 04-29-2014, 12:03 PM   #65 (permalink)
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so what kind of testing did they do? return rate? does the truck have any smoke, or a miss when it drops rail pressure? could indicate a sticking injector

ive never seen this on a duramax however I have had similar things happen on 5.2 Isuzu's
I didn't ask what they did. I assume they opened up the filter head, saw that the check ball and spring were missing, put them back, test drove it and observed no problem, then said it's done.

No smoke, no miss.
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Old 05-05-2014, 09:51 AM   #66 (permalink)
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I'm not celebrating yet, but it looks as if the lift pump cured the problem. It definitely drives a lot livelier than it did before. Spools up faster and accelerates harder. I tried twice yesterday and once today to get it to screw up, and it hasn't yet. Hopefully it stays that way.

The lift pump install was pretty simple, just took a while, about 6 hours total. The only thing not included in the kit is chafe protection for the hoses. I had a little bit of large wire loom in the garage, but need to pick up some more. My only complaint (and not really one) would be that you can't verify if the pump is actually running. I'm going to have somebody push the over-ride button with the truck off and see if I can hear / feel it running. It's that quiet.
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Old 05-05-2014, 10:47 AM   #67 (permalink)
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I'm not celebrating yet, but it looks as if the lift pump cured the problem. .
Did you go with one lift pump or two? I know Kennedy sells them both.
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Old 05-05-2014, 10:56 AM   #68 (permalink)
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Did you go with one lift pump or two? I know Kennedy sells them both.
Single. Easy to add on another to it to make it dual if I want to. But I never will. One more year and it's new truck time for this guy.
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Old 05-05-2014, 08:24 PM   #69 (permalink)
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I'm interested to see what happens in the following weeks. I'm glad that your truck is not messing up at the moment, but I hate to tell ya that I think a lift pump is a band aid for your real problem. The pump is keeping extra fuel pressure and not letting your truck fail as it was before.
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Old 05-06-2014, 02:49 AM   #70 (permalink)
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I'm interested to see what happens in the following weeks. I'm glad that your truck is not messing up at the moment, but I hate to tell ya that I think a lift pump is a band aid for your real problem. The pump is keeping extra fuel pressure and not letting your truck fail as it was before.
And the real problem is?

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Old 05-06-2014, 06:10 AM   #71 (permalink)
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Are you running a factory CP3?

If so how many miles ?
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Old 05-06-2014, 06:12 AM   #72 (permalink)
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Are you running a factory CP3?

If so how many miles ?
Yes. 105,000.
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Old 05-06-2014, 07:57 AM   #73 (permalink)
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I think the lift pump is also a partial band aid to a larger problem

I bet your CP3 is worn out

What about the injector tubes or cups? Injectors ever been removed from the truck?
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Old 05-06-2014, 08:23 AM   #74 (permalink)
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I think the lift pump is also a partial band aid to a larger problem

I bet your CP3 is worn out

What about the injector tubes or cups? Injectors ever been removed from the truck?
Injectors have never been touched.

If my CP3 is "worn out," how could I accelerate from a dead stop to 100 MPH @ 26,000+ PSI 10+ times in a row (before the lift pump) without a single problem? I know very little about the inner workings of a CP3, but it seems like if it was "worn out" I wouldn't be able to do that. And testing a CP3 is just a pressure test, right? Well, I pass that with flying colors.

I'll tell you what I'm not going to do. I'm not going to throw thousands of dollars at this trying to figure out what the "real" cause is when there's nothing wrong with what I've done to fix it. If something else fails, I'll address it. Until then, my truck is running stronger than it ever has.

I'm not going to do what a guy at work did and keep taking my truck back to the dealer every couple weeks and let them keep throwing parts at it until they finally put the right one on and the problem goes away. He was $3500 into and the problem still wasn't fixed. When they finally replaced all the rubber fuel lines, the problem went away. $4500 total repairs that a $400 lift pump would have fixed. And IMO, that's not really a band-aid. That's doing what GM should have done on these engines anyway.
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Old 05-06-2014, 09:43 AM   #75 (permalink)
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Yeah I understand, no sense throwing more money into the truck if you don't plan on keeping it

Hope things work out and the truck stays running strong
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