Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #16  
Old 02-01-2012, 12:36 PM
SpecialDelivery's Avatar
SWFL Benz Clubbin...
 
Join Date: Jun 2011
Location: Cape Coral, FL
Posts: 393
Quote:
Originally Posted by toomany MBZ View Post
Are those jumper lines new?

If not, replace 'em.
Yes the lines are new, changed out again last night after taking these pictures.

Quote:
Originally Posted by MB-Owner-in-ind View Post
When I have taken my lines off and replace them they always seem to leak but the fuel always welled up around the lines where the net is. I just re tighten the lines and the leak stops. You appear to have leaks from the return lines.
did you mean tighten the hard lines? they slip on the barb fittings on either side of the hard line into the injector.

__________________
-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)

Last edited by vstech; 02-01-2012 at 01:24 PM.
Reply With Quote
  #17  
Old 02-01-2012, 01:26 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,835
I agree, the fuel leak seems to come from the return soft lines...
pull off your soft return lines, and look over the nipples SUPER CAREFULLY... I bet they are cracked, or nicked, and fuel is leaking there...
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
  #18  
Old 02-01-2012, 01:29 PM
SpecialDelivery's Avatar
SWFL Benz Clubbin...
 
Join Date: Jun 2011
Location: Cape Coral, FL
Posts: 393
hmmm...they looked ok...I'll look them over again
__________________
-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)
Reply With Quote
  #19  
Old 02-01-2012, 10:08 PM
Registered User
 
Join Date: Jul 2011
Location: Tucson
Posts: 123
I was able to have my injectors rebuilt without lapping. No leaks. I think its hit or miss, honestly. But the fact that two are leaking tells me that perhaps you didn't clean the injector bodies well enough or that its the return lines. You could try to switch the return lines around and see if the leak follows, or there could be something with the injector hard lines.
Reply With Quote
  #20  
Old 02-01-2012, 11:51 PM
SpecialDelivery's Avatar
SWFL Benz Clubbin...
 
Join Date: Jun 2011
Location: Cape Coral, FL
Posts: 393
I replaced both of the injectors return lines last night and one of them is dry today...the other is still leaking pretty badly. I'm a little disappointed that I havent heard back from the vendor on my question of if the injectors were lapped as part of the rebuilding process ... they seem a very through and proficient shop, so I doubt they would leave that out, sounds like an important step to have the highest probability of success.
__________________
-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)
Reply With Quote
  #21  
Old 02-02-2012, 11:18 AM
Registered User
 
Join Date: Dec 2004
Location: Columbia City Indiana
Posts: 345
Quote:
Originally Posted by SpecialDelivery View Post
Yes the lines are new, changed out again last night after taking these pictures.



did you mean tighten the hard lines? they slip on the barb fittings on either side of the hard line into the injector.
Hard lines carry the fuel to the injector and soft lines carry the weep fuel back.
__________________
1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C
Reply With Quote
  #22  
Old 02-02-2012, 11:34 AM
SpecialDelivery's Avatar
SWFL Benz Clubbin...
 
Join Date: Jun 2011
Location: Cape Coral, FL
Posts: 393
no it's not the hard line i do not believe..
__________________
-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)
Reply With Quote
  #23  
Old 02-02-2012, 01:14 PM
SpecialDelivery's Avatar
SWFL Benz Clubbin...
 
Join Date: Jun 2011
Location: Cape Coral, FL
Posts: 393
5 has been dry since changing the jumper line (twice) after replacing the line from 3 to 4 again, third time, 4 was still wet...

well I double checked the hard line and got a VERY slight turn out of #5 and an a larger but still very slight turn out of #4....3 thru 1 arent leaking so I didnt touch them.....

sprayed em down with brake clean so they're dry....we'll see how it goes when I take her out today..

__________________
-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)
Reply With Quote
  #24  
Old 02-04-2012, 08:17 PM
SpecialDelivery's Avatar
SWFL Benz Clubbin...
 
Join Date: Jun 2011
Location: Cape Coral, FL
Posts: 393
tightening down the hardlines stopped the leak...alls good in the hood..cept the vendor..(yall know the name I wont drop it) never returned my email asking about if they're lapped as part of the SOP for rebuilding

Quote:
Originally Posted by SpecialDelivery View Post
5 has been dry since changing the jumper line (twice) after replacing the line from 3 to 4 again, third time, 4 was still wet...

well I double checked the hard line and got a VERY slight turn out of #5 and an a larger but still very slight turn out of #4....3 thru 1 arent leaking so I didnt touch them.....

sprayed em down with brake clean so they're dry....we'll see how it goes when I take her out today..

__________________
-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)
Reply With Quote
  #25  
Old 05-23-2012, 03:15 AM
Registered User
 
Join Date: Nov 2007
Location: Carlsbad, CA
Posts: 520
Leaking (spraying) through the hardline nut center

RE: 603.961 My number 4 injector started spraying fuel upward through the hardline nut at the injector connection.

I got it down to a seep by pulling the nut and realigning the hardline tappered end as perfect to verticle as possible.

Now it is spraying again after replacing the line clips...moved the line a tad I guess and rocked the line head at the injector mating surface? Lines don't seem to be leaking unless it is the cone shaped fixture joint fitted to the injector side of the hard line.

Can I reset the surfaces (injector inlet & hardline cone shaped end) with some valve grinding compound or something.

Or do I need both new injector and new line?

Thanks

Just in case your thinking "return line" that's not it
__________________

1986 300SDL 440,xxx
Reply With Quote
  #26  
Old 05-23-2012, 11:14 AM
whunter's Avatar
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,416
Hmm

Quote:
Originally Posted by 86-300sdl View Post
RE: 603.961 My number 4 injector started spraying fuel upward through the hardline nut at the injector connection.

I got it down to a seep by pulling the nut and realigning the hardline tappered end as perfect to verticle as possible.

Now it is spraying again after replacing the line clips...moved the line a tad I guess and rocked the line head at the injector mating surface? Lines don't seem to be leaking unless it is the cone shaped fixture joint fitted to the injector side of the hard line.

Can I reset the surfaces (injector inlet & hardline cone shaped end) with some valve grinding compound or something.

Or do I need both new injector and new line?

Thanks

Just in case your thinking "return line" that's not it
Best guess, the steel line has a crack, the injector should be OK.


.
__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/
Reply With Quote
  #27  
Old 05-23-2012, 11:42 AM
cirrusman's Avatar
Just add Diesel.
 
Join Date: Aug 2008
Location: Salt Lake City, Utah
Posts: 587
I'm having the same problem here. I bet it's the same vendor too, got the nozzles from them and had another diesel shop put them in as I don't have the tools, and now injectors 1, 3 and 5 are leaking. 1 and 3 I KNOW it's not the lines as I can see the fuel and some air bubbles coming off the seam where the injector meets the engine, I might have not tightened them right, which I'll try and see if that fixes things. #5, I can check the line and write here how it goes... Glad to see this thread going on
__________________
[/SIGPIC]~cirrusman

1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"
[SIGPIC]




1983 Toyota Tercel (Tommy, The little Toyota that could)
1965 Ford F100 (Grandma Ford)
2005 Toyota Sienna (Elsa, Wife's ride)


Gone:
1988 Toyota Pickup
2004 Subaru Outback

1987 Cadillac Fleetwood Brougham
1986 Volvo 740 GL Station Wagon - Piece of junk.
1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.
1987 Pontiac Fiero GT
Reply With Quote
  #28  
Old 05-23-2012, 03:39 PM
Registered User
 
Join Date: Jul 2011
Posts: 399
I'd like to add I thought that I had this problem.

I recently had a set of injectors and cleaned and shimmed. I installed them and noticed moisture in the creases of one of the injectors. Since I'd installed new return hoses and the hard lines were properly tight, unlapped and leaky injectors would be the only thing amiss, right?

I was wrong. After letting the engine idle and get up to temp fuel began to bubble ever so slightly from around the collar nut.

So for future reference, you can't always assume that you have leaky injectors until you carefully examine everything else.
__________________
1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.
Reply With Quote
  #29  
Old 05-23-2012, 05:51 PM
Registered User
 
Join Date: Nov 2007
Location: Carlsbad, CA
Posts: 520
Fuel Leak at the fuel line nut / injector connection

Quote:
Originally Posted by whunter View Post
Best guess, the steel line has a crack, the injector should be OK.


.
Whunter...you were very close. Very worn yet not cracked but leaked none the less.

On your tip by phone today I bought a new #4 metal fuel line, yanked the old line and compared the two at the injector ends. For a moment I thought I had bought an incorrect line as the end that mates with the injector had a lot more "material" on the end then the old one. Old one was very cone shaped while the new one looked somewhat convex (upside down bowl shapped).

Well gave it a shot and "Oh Mama" no more leak......

Old (60+ yrs) MB tech at the dealer says as you did Whunter that through vibration over the years these diesels wear out the connecting line(s) ends to the point they will not hold (seal) against the pressure. Looks like I'll have a few more comming in the future.

Additional take away...refresh those hard fuel line retaining clips...helps minimize fuel line vibration and connection end wear.

Thanks again Whunter!
__________________

1986 300SDL 440,xxx
Reply With Quote
  #30  
Old 05-23-2012, 09:39 PM
whunter's Avatar
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,416
Great

Quote:
Originally Posted by 86-300sdl View Post
Whunter...you were very close. Very worn yet not cracked but leaked none the less.

On your tip by phone today I bought a new #4 metal fuel line, yanked the old line and compared the two at the injector ends. For a moment I thought I had bought an incorrect line as the end that mates with the injector had a lot more "material" on the end then the old one. Old one was very cone shaped while the new one looked somewhat convex (upside down bowl shapped).

Well gave it a shot and "Oh Mama" no more leak......

Old (60+ yrs) MB tech at the dealer says as you did Whunter that through vibration over the years these diesels wear out the connecting line(s) ends to the point they will not hold (seal) against the pressure. Looks like I'll have a few more comming in the future.

Additional take away...refresh those hard fuel line retaining clips...helps minimize fuel line vibration and connection end wear.

Thanks again Whunter!
It was fun talking with you, glad it helped.

Could you please post several pictures of the worn end?


Thanks.

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 07:04 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page