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Old 08-15-2018, 05:07 AM
Redneckgt Redneckgt is offline
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Default Injector return lines

What causes them to pop? Since replacing injectors I've had problems with my left bank. They're getting brittle, I've replaced them with cheapys to the expensive and still they crack and leak.
Any ideas?
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Old 08-15-2018, 06:59 AM
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You have bought the Brand New Bosch return lines and still having issues?
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Old 08-15-2018, 09:20 AM
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Are you overtorquing the return line bolts, they are turqued in in/lbs not ft/lbs

I think it's 10 in/lbs if I'm not mistaken
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Old 08-15-2018, 11:36 AM
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Quote:
Originally Posted by OregonDMAX View Post
Are you overtorquing the return line bolts, they are turqued in in/lbs not ft/lbs

I think it's 10 in/lbs if I'm not mistaken
Return lines dont have bolts.

Try quality lines
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Old 08-15-2018, 12:09 PM
Redneckgt Redneckgt is offline
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Quote:
Originally Posted by Brent@LDS View Post
You have bought the Brand New Bosch return lines and still having issues?
Have not found Bosch lines. Have tried products from doorman, sinister, injectors direct etc.
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Old 08-15-2018, 01:20 PM
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Quote:
Originally Posted by Ne-max View Post
Return lines dont have bolts.

Try quality lines
Shouldn't have assumed, I didn't see it said lbz on the title my bad
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Old 08-15-2018, 02:08 PM
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Merchant lines are Bosch iirc

Sent from my XT1585 using Tapatalk
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Old 08-15-2018, 08:49 PM
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I know you said they're cracked, but also said they pop? Do you have a clog somewhere in the return system? That will make them blow off.

I'm running cheap plastic Tee's on the injectors with the good braided Gates hose, the cheap hose was cracking like you stated before. Haven't had an issue once putting good hose on.
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Old 08-15-2018, 10:03 PM
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Quote:
Originally Posted by Redneckgt View Post
Have not found Bosch lines. Have tried products from doorman, sinister, injectors direct etc.
Try these lines. OEM Bosch units at a unbeatable price!

http://lincolndieselspecialties.com/...line-left.html

http://lincolndieselspecialties.com/...ine-right.html
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Old 08-17-2018, 12:59 PM
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Quote:
Originally Posted by PureHybrid View Post
I know you said they're cracked, but also said they pop? Do you have a clog somewhere in the return system? That will make them blow off.

I'm running cheap plastic Tee's on the injectors with the good braided Gates hose, the cheap hose was cracking like you stated before. Haven't had an issue once putting good hose on.
they crack and fall apart, eventually pop off and pour diesel everywhere
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Old 08-17-2018, 02:22 PM
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If you don't want to spend $120+ for both Bosch sets, you can get a whole roll of the Gates hose for $50 sometimes cheaper. Part # is 27121 I think.
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Old 08-17-2018, 10:38 PM
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Quote:
Originally Posted by PureHybrid View Post
If you don't want to spend $120+ for both Bosch sets, you can get a whole roll of the Gates hose for $50 sometimes cheaper. Part # is 27121 I think.
And then sell remainder of the roll to a buddy and recover most of your $50...

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Old 08-18-2018, 05:50 AM
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Quote:
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And then sell remainder of the roll to a buddy and recover most of your $50...

Hey now, only half

How much of that did you end up using?
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Old 08-18-2018, 06:32 AM
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The hose is not the issue. It's the cheap plastic fittings and oring.
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Old 08-18-2018, 09:28 AM
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Quote:
Originally Posted by PureHybrid View Post
Hey now, only half

How much of that did you end up using?
I've only used about 10' off that spool so far.


One thing I've learned about rubber fuel lines on diesels, prior to like 2011 much of the OEM stuff wasn't very biodiesel stable. Biodiesel properties will cause some rubber compounds to dry out and crack, and BioD eats natural rubber for lunch.

I ran high percentages of BioD on a couple LLY setups without noting any return line issues. But on the wife's 05 MB CDI, everything besides the injector returns had to be replaced after just a year or so. It's a Euro thing.. Running high percentages of bio is like accelerated testing of the typical 5-20% bio you might be encountering in typical pump diesel.

As mentioned above, on the LBZ you shouldn't have any back pressure on returns. If that's all good, pick a better material. AND make sure it's the correct size line..
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