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Old 10-01-2011, 03:19 PM   #18
Raptor626
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This ^ seems to have been posted in late 2009. Do you think GM addressed the issue in the 2011's?
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Old 10-01-2011, 03:38 PM   #19
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No. Same pump and same design. No revised part number has ever been released.
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Old 10-01-2011, 04:11 PM   #20
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No. Same pump and same design. No revised part number has ever been released.
However, the L99 and LS3 OEM pumps are different part numbers. I have still yet to hear or read about an L99 pump failing.
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Old 10-02-2011, 01:16 AM   #21
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Here's the thing though. I'm unclear about what's causing the failure. Is it a faulty design, or are some just defective? I'm asking because the solution, which is to shim the relief valve, seems to imply that the design itself is causing the issue. So if the design is the core of the problem, why the f$@# hasn't GM changed it? Because if it is a design flaw, that means everyone will encounter this issue at one point or another.

I really hope it's just a defective few, because GM would be retarded not to alter the design in some way.
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Old 10-02-2011, 01:18 AM   #22
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No. Same pump and same design. No revised part number has ever been released.
Someone said in the thread I posted that the L99 has a "wider pump gear", I'm not sure if that makes a difference though.
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Old 10-02-2011, 06:20 AM   #23
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Originally Posted by Raptor626 View Post
Here's the thing though. I'm unclear about what's causing the failure. Is it a faulty design, or are some just defective? I'm asking because the solution, which is to shim the relief valve, seems to imply that the design itself is causing the issue. So if the design is the core of the problem, why the f$@# hasn't GM changed it? Because if it is a design flaw, that means everyone will encounter this issue at one point or another.

I really hope it's just a defective few, because GM would be retarded not to alter the design in some way.
What I was told is it is the bore in the housing that is not machined correctly or the finish on the relief valve bore is not polished fine enough. Call ADM he can explain it better. How many miles do you have on your car?
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Old 10-02-2011, 10:46 AM   #24
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Someone said in the thread I posted that the L99 has a "wider pump gear", I'm not sure if that makes a difference though.
The problem doesn't have to do with the pump gear, it's casting imperfections causing the pressure spring to stick and then not provide pressure. If there's no pressure to drive the pump it doesn't matter the size of the gear. Whether or not it has less casting imperfections is anyones guess.

Considering the number of LS based vehicles out there the failure rate is incredibly low. I plan on taking mine out and giving it a port/polish when I do my cam swap just to be safe. But if you're under warranty then don't worry about it. I wouldn't tear apart the front of my motor just for that.
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