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Discussion Starter #1
i was quoted $3200 to fix my (fuel cooler, all new lines from the tank to the front). there has to be an easier and cheaper way to fix it. im being told the quick connect fittings are only made by GM so thats why they are so much money. if anybody has any advice as to what i should do please chime in or send me a pm.

ps the truck wont even start unless primed but only runs for about 5-10 seconds

the truck is a 2003
 

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Here some info-- the supply line is 1/2 inch the return is 3/8--
#PIP4526: Diesel Engine Fuel Line Repairs - keywords DTC hose kink loss P0087 P0093 P1093 pipe power reduced repair restrict restriction SES suction supply vacuum - (Nov 7, 2008)

Subject: Diesel Engine Fuel Line Repairs

Models: 2001-2007 Chevrolet Silverado Classic

2001-2007 GMC Sierra Classic

2007-2009 Chevrolet Silverado

2007-2009 GMC Sierra

Equipped with the 6.6L Diesel Engine RPO codes LB7 LBZ LLY LMM

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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
A dealer may need to perform a repair on the rubber portion of the fuel supply (suction) lines. The rubber section of the line could become kinked or collapse. Fuel lines that kink or collapse may induce a fuel system restriction (high vacuum gauge readings) or DTCs P0087, P0093, and/or P1093 to set.

If a technician was to suspect the rubber portion of the fuel feed line collapsing or kinking, replacement of only the rubber line is acceptable.

Recommendation/Instructions:
Complete the steps below to repair the rubber section of fuel supply line:

Carefully cut, split, and remove the OEM crimp from both ends of the flexible hose. These crimps can be cut with a small cut-off wheel. Split the crimp into two pieces (use your discretion on first cut location, then cut directly across from, or 180 degrees from first cut). Special care must be taken not to damage the flare on the end of the steel pipe that will be reused.
Remove the OEM crimps and flexible portion of hose from the existing supply line.
If replacing the rubber section of the supply line, a 1/2 ID hose meeting SAE specification 100R3 is suggested. Dealers may be able to find a local supplier for this hose, or can contact the manufacturer Parker Hannifin. The replacement hose would be a 1/2" diameter Parker part number 601-8 or H017-8. To find a local distributor the Parker website can be accessed at Please wait while we redirect...
Use worm type hose clamps (use double clamps on each end) to attach the replacement hose to the existing pipe.
 

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That quote is way high...........while they are rather expensive, you are looking at maybe $1300 for everything with not too many hours of labor. I replaced these when I swapped my motor.
 

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Yes I believe you have to get them from GM.......it sucks because they are super expensive. I think there are 3 lines and the fuel cooler. They may not bee as much as I said, but maybe installed.
 

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i have a2002 gmc with a duramax truck the truck start rusabout 10 -15 seconds then stalls onece primed runs after that it runs great
 

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i have a2002 gmc with a duramax truck the truck start rusabout 10 -15 seconds then stalls onece primed runs after that it runs great
You have a leak at the fuel filter housing-- most likely! Several supporting vendors have seal kits for the housing, and even new housings at reasonable prices.
 

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Alligator, Merchant Auto, Duramax store-! These guys support the Forum and have good prices. Do not buy the housing from GM--$$$$.
 

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Discussion Starter #10
Ok guys I rebuilt my fuel filter head and still no go. It's doing the same thing as before (running for about 5-10 secs then dies). Any other suggestions?
 

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Alligator, Merchant Auto, Duramax store-! These guys support the Forum and have good prices. Do not buy the housing from GM--$$$$.
amen about $600, Have you checked if the water in fuel sensor is leaking? i had a truck that was pouring fuel out of ther and that will do it. Might as well replace the filter while your there to make sure the threads arents screwed up where the water in fuel sensor screws in.
 

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I didn't notice any leaks from there, do you think I should replace it anyways?
Well i think you would at least have a very slow drip if nothing else if there was a problem around the WIF sensor. Other than that it would almost have to be in a line somewhere. A suprisingly small leak will make you lose prime.
 

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Discussion Starter #15
Ok let me see if I got this right. If I install an airdog I don't run it through the stock fuel lines? Because I would've done that a long time ago.
 

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Cornish- check the suction line very closely at the clamp on left back of block- had two that the clamp had stretched and vibrated pin hole in line. It won't leak-might seep a little but hard to spot. I ran air dog on my 04.5LLY mostly to prevent cavitation- but if your suction line is rusted/leaking you'll need to at least repair that first. I replaced a line system on a 4500 and they have deleted cooler. Don't know for sure on p/us. Hope this helps....
 

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leaking fuel lines

I have leaks in my fuel lines up behind the front and second door I have a 3500 duramax sierra 2003 we had a estimate of 900.00 to fix could you let me know is this fail or also can the lines be splited to repair
 

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Just add a lift pump, most come with rubber line to replace from the tank to the drivers side engine bay.
 
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Moved to LB7-
 
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