Duramax Diesels Forum Truck of the Week
  #1  
Old 12-22-2017, 03:41 PM
alohazabel alohazabel is offline
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Default LLY fuel leak #1 injector return line

Started smelling diesel yesterday, Found the return line was popped off of the #1 injector, tapped it back in, replaced clip, took it for a drive, got back and there was diesel just pouring out of between where the return line plugs on to the plastic t in the top of the injector.

Pretty major leak. First I was thinking I broke the little plastic fitting when I tapped it back in, but it seems like a lot of fuel... Is that normal or

Is there something else (like a bad injector) going on here that caused the return line to pop off in the first place?
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Old 12-22-2017, 03:50 PM
alohazabel alohazabel is offline
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forgot to mention that I just finished doing the head gaskets a couple hundred miles ago, so had all the injectors out, and put new return lines on, possible that i just didnt get the clip in right or something
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Old 12-22-2017, 05:09 PM
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IOWA LLY IOWA LLY is offline
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What brand of return lines?


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2003 GMC CCSB LLY
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2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
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Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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Old 12-22-2017, 05:29 PM
alohazabel alohazabel is offline
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not sure. yellow plastic fittings, and I had to cut the hose to fit.

ebay cheapies:

https://www.ebay.com/itm/2004-5-2010...item2ecf222159
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Old 12-22-2017, 07:00 PM
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And we have our problem!!
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Without a duramax... hopefully not for long.

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Old 12-22-2017, 10:17 PM
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Exactly. Buy good return lines and your problem will be solved


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2003 GMC CCSB LLY
Built by me, tuned by me.

2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
2012 ECI Diesel Truck Points Champion

Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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Old 12-23-2017, 08:53 AM
alohazabel alohazabel is offline
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yeah, not sure why I cheaped out on the return lines. I bucked up for the good stuff on everything else.

ebay said they had sold like 600 sets of them, and the reviews on there were all ok, but I should have known.


Which return lines would you suggest (other than crazy outrageously priced ones from the dealer)?
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Old 12-23-2017, 08:59 AM
alohazabel alohazabel is offline
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the ones i'm seeing on the diesel parts websites look just like the ones i used
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Old 12-23-2017, 09:03 AM
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Quote:
Originally Posted by alohazabel View Post
yeah, not sure why I cheaped out on the return lines. I bucked up for the good stuff on everything else.



ebay said they had sold like 600 sets of them, and the reviews on there were all ok, but I should have known.





Which return lines would you suggest (other than crazy outrageously priced ones from the dealer)?


Yes those. The OEM Bosch lines. Because, well, idk, they actually work....

Buy them from Merchant automotive. Heís got the best price on them.


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__________________
2003 GMC CCSB LLY
Built by me, tuned by me.

2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
2012 ECI Diesel Truck Points Champion

Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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Old 12-23-2017, 09:12 AM
alohazabel alohazabel is offline
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OK, I see them now, first time I looked on merchant I just saw the yellow ones.

Those black ones don't say bosch in the description, but look just like the originals... and the price isn't too bad. Are those the ones you're talking about?I think the dealers wanted like 3x that much.

Thanks for the help. I'll let you know how it turns out.
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Old 12-23-2017, 09:42 AM
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Yes they are the same as what you would buy from GM. They are the only ones I will use. Iíve tried them all. The yellow ones are absolute garbage.


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__________________
2003 GMC CCSB LLY
Built by me, tuned by me.

2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
2012 ECI Diesel Truck Points Champion

Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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