2007 lbz fuel cooler leaking at 60,000 miles - Chevy and GMC Duramax Diesel Forum
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Old 07-06-2012, 08:00 PM   eBay Motors  #1 (permalink)
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2007 lbz fuel cooler leaking at 60,000 miles

well as the title reads " 2007 lbz fuel cooler leaking at 60,000 miles." The cooler is not actually leaking.
but where the fuel line attaches to the cooler is. the metal lines that attach to the fuel cooler on both
sides look rusty... but it's only leaking from the one side near the frame rail.(the line to the right in the picture below)



the metal line coming out of the fuel cooler looks like it can be replaced??? Can I replace the metal fitting on
the cooler with out replacing the whole cooler?

I found this website that shows the parts. and it does not show a replacement fittings for the fuel cooler.

CK2,3(43) FUEL SUPPLY SYSTEM-FRONT (LBZ/6.6D);. Fits: AVALANCHE 2WD 1500, AVALANCHE 2WD 2500, AVALANCHE 4WD 1500, AVALANCHE 4WD 2500, AVALANCHE 4WD 2500 LS, AVALANCHE 4WD... | Nalley Buick GMC Brunswick

and I used he google machine and the search button on this forum. didn't come up with much other then
bypassing the cooler... and does anyone know if a company that makes stainless steel replacement lines?
I might as well replace the lines from the tank to the motor if I can find some SS lines...
thanks,
jeephauler77

Last edited by jeephauler77; 07-06-2012 at 08:05 PM.
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Old 07-09-2012, 05:54 PM   eBay Motors  #2 (permalink)
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fixed for $4.32. I borrowed a line flange making tool, bought some o-rings, 3/8" line nut, and a new line. and came up with this:

old stuff:


new stuff:


I don't know why the dealership does not sell these two lines or the aftermarket world... Had I been a little smarter... I would have made them out of stainless steel!

I came across two cool tools while doing this project:

1.



2.



the funny part about this story. after borrowing tools, finding seals, and leaking diesel fuel every where
I ended up stripping (cross threading) the left side of the fuel cooler (the side that was not leaking) and managed to
fix the right side of the fuel cooler. so long story short after all this work and research I ended up spending a $195 for
a new fuel cooler and for now no leaking! lol. but the lesson to be learned was take the fuel cooler out when replacing the
fittings.

jeephauler77

Last edited by jeephauler77; 07-09-2012 at 06:02 PM.
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Old 07-09-2012, 07:00 PM   eBay Motors  #3 (permalink)
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other links:

Fuel line quick connect - Page 2 - TheDieselPage.com Forums

Need help with a fuel leak

Last edited by jeephauler77; 07-09-2012 at 07:04 PM.
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Old 10-10-2012, 02:49 AM   eBay Motors  #4 (permalink)
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Quote:
Originally Posted by jeephauler77 View Post
fixed for $4.32. I borrowed a line flange making tool, bought some o-rings, 3/8" line nut, and a new line. and came up with this:

old stuff:


new stuff:


I don't know why the dealership does not sell these two lines or the aftermarket world... Had I been a little smarter... I would have made them out of stainless steel!

I came across two cool tools while doing this project:

1.

Fuel and A/C Quick Disconnect Pliers - YouTube


2.

Mastercool Hydraflare Flaring Tool - YouTube


the funny part about this story. after borrowing tools, finding seals, and leaking diesel fuel every where
I ended up stripping (cross threading) the left side of the fuel cooler (the side that was not leaking) and managed to
fix the right side of the fuel cooler. so long story short after all this work and research I ended up spending a $195 for
a new fuel cooler and for now no leaking! lol. but the lesson to be learned was take the fuel cooler out when replacing the fittings.

jeephauler77

Where did you find those new fitting that go in the cooler?
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Old 10-12-2012, 07:30 PM   eBay Motors  #5 (permalink)
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Where did you find those new fitting that go in the cooler?
Napa.
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Old 10-12-2012, 07:37 PM   eBay Motors  #6 (permalink)
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I went there they said no but the counter guy seemed like a retard. I ended up at the dealer. Bought the cooler and complete front line set.


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Banks intake and cat back,Diamond Eye downpipe and frount pipe,EGR Blocker Plate,PPE bleeder screw,HIDs,Big O ace throttle spring,linex bed liner,big blue nuts, Afe Mouthpiece with the res and pvc ports welded shut Auto Meter Phantom 2 boost, pyro and frp, EFI tuned buy duramaxtuner, pro stock pvc and Frount and rear Weather Tech floor liners, Big Dipper stage 4 built by Todd Spalding.

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Old 10-12-2012, 10:08 PM   eBay Motors  #7 (permalink)
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Great info here.

Thanks
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Old 10-12-2012, 10:35 PM   eBay Motors  #8 (permalink)
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The steps I have taken to combat having to buy the cooler and lines again are.

Primed and painted the cooler, cooler guards ,brackets and the lines

Anti seize the fittings the thread into the cooler.

I hope to never have to do this again.

It seams the quick couplers are quick to install but a real mofo to take apart. Both of the male ends I pulled apart where corroded inside the female coupler. Witch meant prying the retainer out very carefully and twisting the line to get it to break free. GM dies not have a listing for there retainers but you can buy them at napa and a few other parts houses if you bend the hell out of them.




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Old 10-29-2012, 08:09 PM   eBay Motors  #9 (permalink)
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sorry for the delay. I have been working on my house. trying to get it ready to sell... The lines, line nut, and the flares are the easy parts. Well as long as you have some coin to drop on a flare tool or a good friend to borrow one from. It's the retainer clips and the orings. I was able to match up the little orange o-rings with some new black ones from an assortment bin at napa. but the other larger o-ring gm, napa, classic tube, and a couple others do not have a listing or size. The retainer clips at napa or autozone looked like they did not match up 100% so I was going to reuse the old ones... I was going to start making sets of new rebuilt stainless steel ones. But found a dead end with the o-rings...

jeephauler
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Old 01-27-2014, 01:44 PM   eBay Motors  #10 (permalink)
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Jeephauler
My apologies for reviving to such an old thread, but I have a leaking fuel cooler and I suspect it to be a rusted out line like you had.

I'm very interested in making the replacement 3" lines like you did, but I'm curious how that tube stop bead was made? What type of tool did your friend have that you borrowed to make that? Was it that Mastercool that you linked to? Funds are kind of tight and was hoping to borrow tools like you did and make the replacement pieces. I'm already going to have to replace my fuel and brake lines since the truck came from the midwest with all the salt on the roads, figured I'd try to save a little $ by not buying a new cooler if I can help it.

Thanks!!
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