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
  #1  
Old 11-12-2018, 12:31 PM
Registered User
 
Join Date: Jul 2018
Location: Jackson Michigan
Posts: 39
huge puddle of diesel fuel on garage floor...

My 87 W201 turbo diesel has been sitting in the garage for about two weeks. Yesterday I went to move the car and discovered a large puddle of fuel on the garage floor. The puddle is directly below the IP pump. Both the supply and return fuel lines show no indication of leaking. The lift pump also seems fine.

The leak(s) appear to be coming from the IP pump where the hard lines connect into the pump.... however I'm not 100% sure. At the very least, the top of the pump is wet.

Anyway, is this a case where the delivery valve O-rings have perished?
Reply With Quote
  #2  
Old 11-12-2018, 12:51 PM
renaissanceman's Avatar
Registered User
 
Join Date: Nov 2014
Location: Central CA
Posts: 774
Quote:
Originally Posted by Doc Brown View Post
My 87 W201 turbo diesel has been sitting in the garage for about two weeks. Yesterday I went to move the car and discovered a large puddle of fuel on the garage floor. The puddle is directly below the IP pump. Both the supply and return fuel lines show no indication of leaking. The lift pump also seems fine.

The leak(s) appear to be coming from the IP pump where the hard lines connect into the pump.... however I'm not 100% sure. At the very least, the top of the pump is wet.

Anyway, is this a case where the delivery valve O-rings have perished?
Could be, but have you checked your fuel thermostat for leaks? The DV o rings don't generally leave a puddle, but the thermostat does.
__________________
RenaissanceMan Labs: where the future is being made today.

Garage:

2005 Volvo S40 T5 AWD, 77k
1998 Saturn SL2, 244k - 35 mpg (gone, never forgotten)
1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg
1993 Tracker 4x4, 2 door, 8v, 3 sp auto. 134k - 25 mpg
1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 110k - 28.6 mpg

WARNING: this post contains thoughts that may be discovered by the state of California to cause cancer.
Reply With Quote
  #3  
Old 11-12-2018, 01:10 PM
Registered User
 
Join Date: Nov 2009
Posts: 80
Quote:
Originally Posted by renaissanceman View Post
Could be, but have you checked your fuel thermostat for leaks? The DV o rings don't generally leave a puddle, but the thermostat does.
I have a spare, with fresh o rings if you need one.
__________________
Rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz
Reply With Quote
  #4  
Old 11-12-2018, 01:42 PM
Registered User
 
Join Date: Jul 2018
Location: Jackson Michigan
Posts: 39
I forgot to mention, the fuel thermostat was removed from the system a few months ago.
Reply With Quote
  #5  
Old 11-12-2018, 03:40 PM
Registered User
 
Join Date: Dec 2006
Posts: 3,339
Delivery valve seals could be the culprit. But a really big leak suggests a broken hard line. They tend to break right above the ferrule. What you want to do is clean everything with brake cleaner and the run the engine until you spot the leak.
Reply With Quote
  #6  
Old 11-12-2018, 08:39 PM
Registered User
 
Join Date: Jul 2018
Location: Jackson Michigan
Posts: 39
I'll take a better look at the hard lines tomorrow evening. Thanks!
Reply With Quote
  #7  
Old 11-12-2018, 10:22 PM
Mad Scientist
 
Join Date: Dec 2012
Location: Oregon
Posts: 1,440
The pump diesel here fluoresces weakly under UV. A UV light was cheap on Amazon and was handy looking for leaks, the green glow will help you find a leak faster than you can see it by bare eye.
__________________
617 swapped Toyota Pickup, 22-24 MPG, 44k miles on swap
Reply With Quote
  #8  
Old 11-13-2018, 12:54 AM
Father Of Giants's Avatar
Registered User
 
Join Date: Feb 2017
Location: Newport News, Virginia
Posts: 1,228
Quote:
Originally Posted by OM617YOTA View Post
The pump diesel here fluoresces weakly under UV. A UV light was cheap on Amazon and was handy looking for leaks, the green glow will help you find a leak faster than you can see it by bare eye.
Amazing tip
__________________
1986 Mercedes 300SDL Black - 320,000 miles. Out of retirement

1997 E300 Captain Slow - 218,000 miles

2000 Mercedes E320 Black - 136,000 miles - New daily driver.

Don't forget to grease the screw and threads on the spring compressor.
Reply With Quote
  #9  
Old 11-13-2018, 08:28 PM
Registered User
 
Join Date: Jul 2018
Location: Jackson Michigan
Posts: 39
I went ahead and sprayed brake cleaner all over the injector pump and side of the block. After about an hour the area was all dried up.

The picture is a 'dry shot'

Anyway I ran the engine for about 1/2 hour and the IP was still dry. Hmm
I reckon I'll let it sit over night and take another look.

[IMG][/IMG]
Reply With Quote
  #10  
Old 11-13-2018, 10:00 PM
Registered User
 
Join Date: Sep 2007
Location: Calgary Alberta Canada
Posts: 1,197
Check your motor mounts same color hydralic fluid.
__________________
92 e300d2.5t
Reply With Quote
  #11  
Old 11-29-2018, 06:24 PM
Registered User
 
Join Date: Jul 2018
Location: Jackson Michigan
Posts: 39
So the car has been sitting 12 days since I last started the engine. The huge puddle of fuel has re-appeared.

[IMG][/IMG]





Seems like a lot of fuel...



The delivery valve holders are wet...




The top of the motor mount is wet...

The fuel lines are dry on surface, the lift pump is dry is dry on surface

the car starts up about the same, hard to tell because of the cold weather.


Any ideas?
Reply With Quote
  #12  
Old 11-29-2018, 07:52 PM
Registered User
 
Join Date: Nov 2013
Location: San Mateo, CA
Posts: 737
Injector hard lines may not be seating properly on top of the delivery valves
(allowing fuel to slowly leak out of the hard lines when the car sits for a long while).

The number two hard line in particular looks askew.

White tissue paper is ideal to use for a touch test to find those hard to spot fuel seepage locations.
__________________
79 300SD 'Stormcloud' new as of 10/22/2017
78 300SD 'Desert Rose' new as of 01/26/2014
83 300SD 'Rena 2.0' with engine from 82 300SD 'Rena' (SOLD & crushed 11-20-2017)
Reply With Quote
  #13  
Old 11-29-2018, 08:52 PM
Registered User
 
Join Date: Jul 2018
Location: Jackson Michigan
Posts: 39
Hmm, based on your suggestion, I think I'll try an experiment.

if the DV's or hard lines are leaking then tissue paper around these parts should wick up most of the fuel before it leaks on the ground....

The car is off the road for the rest of the winter so I have a few months to sort this out.
Reply With Quote
  #14  
Old 11-29-2018, 09:07 PM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Location: Texas Hill Country
Posts: 4,334
Might be worth a check of the clear (probably brown now) line on the backside of the IP back up to the filter housing. If the banjo bolt is loose or the line is cracked, it's possible for fuel to leak out under gravity through the return line.
__________________
'11 Honda Accord EX - "The Daily" 64K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "The Diseasel Jr." 168K
'86 300SDL - "The Diseasel" 189K (Totaled 1/31/19)
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
Reply With Quote
  #15  
Old 11-29-2018, 09:21 PM
Registered User
 
Join Date: Dec 2006
Posts: 3,339
How does the fuel filter look? Could be a leaky filter seal or bad o-ring. Also, check the backside of the IP.
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 07:01 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page