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LB7 GM Duramax Discuss the 1st Generation Duramax here |
11-17-2015, 05:12 PM
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#1
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Name: Kvw4x4
Title: Diesel Enthusiast
Status: Not Here
Join Date: Sep 2012
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Posts: 117
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2003 Duramax 130k. Losing prime!!!
I'm at my end with my cousins truck. Continually loses prime the longer it sits. Usually within 1 hour of being shut off it already cranks extra long to start. By 24 hours it won't start. Usually pulling fuel filter and replacing it will get it to start. We have replaced fuel filter housing and lines around it. We have tried running a fass lift pump. We have replaced the cp3 ?, the injectors have been tested by 2 different diesel shops. Still has the same symptoms. Just yesterday I laid under truck near fuel tank and did notice a leak where soft line coming from fuel sending unit connects to hard line. It is the line to pump not the return line. Please any idea would help.
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__________________
2008 ccsb duramax 2012 front bumper upgrade, efi live "idaho rob" 4" exhaust, 4" lift 35s
1985 k20 sclb 1994 12 valvecummins 500hp southbend clutch nv4500, 7 x .010 injectors, hx40 with batmo wheel, 4" exhaust, 3gsk, fuel plate removed
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11-17-2015, 08:00 PM
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#2
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Name: TheBac
Title: UPS guy
Status: Not Here
Join Date: Oct 2009
Location: Mid Michigan
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Posts: 2,344
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Pin hole leak in hard line? Need to pressurize system slightly to find it.
Collapsed/broken down braided lines under truck? The ones up under the driver's door or around trans?
__________________
Tom
"BBT" -- 2003 GMC CC/SB 4x4 12.14@111.15
"KLESHAY" -- 2000 C5 Corvette -- the toy
2017 Buick Regal 2.0T -- the DD
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11-17-2015, 08:53 PM
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#3
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Name: Kvw4x4
Title: Diesel Enthusiast
Status: Not Here
Join Date: Sep 2012
Member`s Gallery
Posts: 117
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Quote:
Originally Posted by TheBac
Pin hole leak in hard line? Need to pressurize system slightly to find it.
Collapsed/broken down braided lines under truck? The ones up under the driver's door or around trans?
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How can I pressurize system?
__________________
2008 ccsb duramax 2012 front bumper upgrade, efi live "idaho rob" 4" exhaust, 4" lift 35s
1985 k20 sclb 1994 12 valvecummins 500hp southbend clutch nv4500, 7 x .010 injectors, hx40 with batmo wheel, 4" exhaust, 3gsk, fuel plate removed
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11-18-2015, 07:38 AM
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#4
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Name: DirtyMaxx03
Title: Too Much Time
Status: Not Here
Join Date: May 2011
Location: San Antonio, TX
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Posts: 2,862
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More than likely you need a rebuild kit for the filter housing. they are cheap
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Sean
Stock 2005 LLY
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11-18-2015, 08:52 AM
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#5
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Name: Kvw4x4
Title: Diesel Enthusiast
Status: Not Here
Join Date: Sep 2012
Member`s Gallery
Posts: 117
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Quote:
Originally Posted by DirtyMaxx03
More than likely you need a rebuild kit for the filter housing. they are cheap
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the dealership put a new fuel filter housing on
__________________
2008 ccsb duramax 2012 front bumper upgrade, efi live "idaho rob" 4" exhaust, 4" lift 35s
1985 k20 sclb 1994 12 valvecummins 500hp southbend clutch nv4500, 7 x .010 injectors, hx40 with batmo wheel, 4" exhaust, 3gsk, fuel plate removed
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11-18-2015, 08:58 AM
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#6
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Name: zfaylor
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Nov 2010
Location: P-TOWN!, Indiana
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Posts: 5,024
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Quote:
Originally Posted by DirtyMaxx03
More than likely you need a rebuild kit for the filter housing. they are cheap
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This. Only worked on one duramax in my life and it had the same issues you are describing. Filter base rebuild solved the problem.
Dealership putting a new base on has to be taken with a grain of salt. With dealerships they seem to be extremely good with diesels or have zero clue what they are doing.
__________________
2015 half ton heavy chevy
81 Fairmont LS project
Many yard ornament projects...
North American Turbo
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02-29-2016, 03:05 PM
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#7
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Name: J17HENRY
Title: Rookie
Status: Not Here
Join Date: Mar 2013
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Posts: 11
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Filter housing.
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02-29-2016, 04:34 PM
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#8
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Name: Chris Tobin
Title: Too Much Time
Status: Not Here
Join Date: Jun 2008
Location: Dayton, TN
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Posts: 2,662
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Here is the Merchant Automotive basic filter head rebuild kit:
https://www.merchant-automotive.com/...0-duramax.aspx
And here is the Deluxe kit with billet goodies... If you can spring the cost, I'd do the deluxe kit...
https://www.merchant-automotive.com/...plug-bleeder-s
__________________
Chris Tobin
Editor--Ultimate Diesel Builder's Guide
Freelance Editor and Photographer
Working with DIESEL WORLD, DIRT SPORTS, MUSCLE CAR POWER & STREET TRUCKS magazines
tobinemail@aol.com
I might be able to help get you in a mag.
Custom poster size photos available. PM or email for info.
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03-11-2016, 06:08 PM
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#9
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Name: SmokeSmacked02
Title: Green Behind the Ears
Status: Not Here
Join Date: Sep 2011
Location: Franklin Tn
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Posts: 79
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Or you can run to your local O'Reillys for a Dorman 904-124, cheap and quick to get ahold of if you have a store close by.
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