Duramax Diesels Forum Truck of the Week
  #31  
Old 05-27-2020, 09:19 PM
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If you have the pump out, would you be willing to remove the gear pump off the back and see if the drive shaft tab is intact? I had one break on my and the pump stopped completely.

I fixed mine but was curious if yours failed the same way. If course you will have to put it all back together if you need to send it back as a core
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  #32  
Old 05-28-2020, 03:29 AM
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Originally Posted by 2004LB7 View Post
If you have the pump out, would you be willing to remove the gear pump off the back and see if the drive shaft tab is intact? I had one break on my and the pump stopped completely.

I fixed mine but was curious if yours failed the same way. If course you will have to put it all back together if you need to send it back as a core
Yeah i prob could do that.. im curious myself. With pump out and i spin gear by hand fuel only came out of return. I held finger over supply inlet, spun gear around few times the. Their was suction on my finger. Removed finger and Little bit of fuel shot up and out of return only. Obviously whatever fuel was remaining in pump after removal. But again nothing out of high pressure side. There was fuel sitting in the high pressure side port, just never come out
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  #33  
Old 05-28-2020, 06:38 AM
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Originally Posted by Mxz8002003 View Post
Okay so got the lb7 torn down tonight to be able to get cp3 out. 3 1/2hrs and 4 brewskis. Not bad i didnt think. (Tare down is easy right) I dont think it will be to bad going back together. No doubt my Previous Encounters with doing injectors on the lb7 helped me tonight. Although you take/remove many other parts that with injectors u do not.. Ended up going back with stock original through LDS. LDS is who i bought my injectors through when i had my first lb7 and was very new to the duramax. Was even contemplating on doing them myself. LDS emailed a very good pdf/DIY of lb7 injectors to me that made the job go off without a hitch. Did a little bullshi**ing with Brent today on our low milage lb7ís.. Pump should be here tomorrow.
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Originally Posted by Mxz8002003 View Post
Also BdSankey thanks For the quotes and input on different cp3ís.

No problem, glad to help! Brent and the crew over at LDS are phenomenal to work with and you're definitely in good hands. Hopefully this fixes your issue (I can't really think of anything else it would be if you're not getting any fuel out of the high pressure side of the pump but have fuel at the inlet of the pump).
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  #34  
Old 05-28-2020, 09:46 AM
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Quote:
Originally Posted by Mxz8002003 View Post
Yeah i prob could do that.. im curious myself. With pump out and i spin gear by hand fuel only came out of return. I held finger over supply inlet, spun gear around few times the. Their was suction on my finger. Removed finger and Little bit of fuel shot up and out of return only. Obviously whatever fuel was remaining in pump after removal. But again nothing out of high pressure side. There was fuel sitting in the high pressure side port, just never come out
Sounds like the gear pump is working but something else is busted inside.
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2008 Chevrolet 3500HD DRW LTZ
285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

2006 BRM Jetta TDI. Injectors, turbo, Malone custom tuning on ecm and tcm
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  #35  
Old 05-28-2020, 07:52 PM
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Okay just got the truck back together, fired up after about ten seconds of cranking. Let it run for about ten mins, sounds good, shut it off and started it a couple times with no problems.. first initial look over my work, i see no leaks, everything looking good. Will do a better in spec tomorrow and a little rd test.
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  #36  
Old 05-28-2020, 08:48 PM
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Glad you got it fixed. Thanks for posting up the resolution, for others in the future who may be facing similar issues with their truck as we try to keep our old LB7's on the road.
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  #37  
Old 05-28-2020, 11:33 PM
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285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

2006 BRM Jetta TDI. Injectors, turbo, Malone custom tuning on ecm and tcm
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