Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Small fuel rail leak

Thread Tools
 
Search this Thread
 
Old 12-19-2013, 03:09 PM
  #1  
928newb
Advanced
Thread Starter
 
928newb's Avatar
 
Join Date: Oct 2013
Location: Phoenix, AZ
Posts: 99
Likes: 0
Received 1 Like on 1 Post
Unhappy Small fuel rail leak

I have found that the connection between the 90 degree elbow of the fuel rail and fuel damper on the drivers side is not 100%.

It is not enough to drip, but when i checked it, my finger was moist with fuel.

Rail and damper are perfectly aligned, the nut goes on without effort and I tightened it as good as could.

Is there a way (other than replacing rail and damper) to fix this?

Thanks in advance for your input.
Old 12-19-2013, 03:41 PM
  #2  
Speedtoys
Rennlist Member
 
Speedtoys's Avatar
 
Join Date: Sep 2010
Location: Boulder Creek, CA
Posts: 13,582
Received 1,034 Likes on 623 Posts
Default

Might be best to remove the fuel rails entirely, and just R&R the injector Orings, and all three dampers/regulators.

It's a sign.
Old 12-19-2013, 04:06 PM
  #3  
M. Requin
Rennlist Member
 
M. Requin's Avatar
 
Join Date: Mar 2007
Location: Central Virginia
Posts: 3,625
Received 60 Likes on 39 Posts
Default

Originally Posted by Speedtoys
Might be best to remove the fuel rails entirely, and just R&R the injector Orings, and all three dampers/regulators.

It's a sign.
It is indeed. I would not drive that car until this is corrected.
Old 12-19-2013, 04:19 PM
  #4  
auzivision
Drifting
 
auzivision's Avatar
 
Join Date: Jun 2006
Location: Indianapolis Area
Posts: 2,707
Received 73 Likes on 39 Posts
Default

Yeah a small fuel leak is like being a little bit pregnant. Might try to spay some carb cleaner on a rag and make 100% certain everything at the junction is clean.

Just because the nut goes on without a fight, doesn't mean everything is perfectly aligned. Might try loosening a little, then wiggle a little, then snugging back up hoping the nut turns a little further.
Old 12-19-2013, 04:39 PM
  #5  
davek9
Rennlist Member
 
davek9's Avatar
 
Join Date: Jul 2006
Location: Bloomfield, MI
Posts: 5,148
Received 345 Likes on 191 Posts
Default

there was a sealant mentioned here by Loctite that is made for those types of connections, haven't used it yet but others here have.
Old 12-19-2013, 08:36 PM
  #6  
pjg
Racer
 
pjg's Avatar
 
Join Date: Dec 2009
Location: Mass
Posts: 423
Likes: 0
Received 1 Like on 1 Post
Default

The loctite 574 solution was covered in this thread.

https://rennlist.com/forums/928-foru...ail-issue.html

Last edited by pjg; 12-19-2013 at 08:37 PM. Reason: typo
Old 12-19-2013, 08:41 PM
  #7  
Chalkboss
Rennlist Member
 
Chalkboss's Avatar
 
Join Date: Oct 2012
Location: California
Posts: 2,399
Received 183 Likes on 114 Posts
Default

Just did all my lines in the engine bay. Had one very slight seepage at the front regulator to supply. Loosened up, re tightened and that did the trick. Dont go gorrilla on these fittings. Please check all the rubber lines as they can look ok but be badly cracked and hardened. Mine were, but taking a casual glance looked fine at first.
Old 12-20-2013, 01:39 AM
  #8  
Bill Ball
Under the Lift
Lifetime Rennlist
Member
 
Bill Ball's Avatar
 
Join Date: Mar 2002
Location: Buckeye, AZ
Posts: 18,647
Received 49 Likes on 36 Posts
Default

Open it up and check for a burr or piece of grit fouling the sealing surface. Once I had a heck of a time getting that one to seal on my car too. I had to take the rail and damper off the car and study it. I needed to bend the damper mount bracket. Even though it threaded and cinched down, the alignment wasn't quite right to allow it to seal.
Old 12-20-2013, 10:40 AM
  #9  
928newb
Advanced
Thread Starter
 
928newb's Avatar
 
Join Date: Oct 2013
Location: Phoenix, AZ
Posts: 99
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by Speedtoys
Might be best to remove the fuel rails entirely, and just R&R the injector Orings, and all three dampers/regulators.

It's a sign.
I actually replaced the stock injectors with new 4 hole injectors, so the seals are gtg...
Old 12-20-2013, 10:43 AM
  #10  
928newb
Advanced
Thread Starter
 
928newb's Avatar
 
Join Date: Oct 2013
Location: Phoenix, AZ
Posts: 99
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by pjg
The loctite 574 solution was covered in this thread.

https://rennlist.com/forums/928-foru...ail-issue.html
Thanks, I`ll check the connection one more time for scratches etc... if all else fails, loctite it is.
Old 12-20-2013, 10:44 AM
  #11  
928newb
Advanced
Thread Starter
 
928newb's Avatar
 
Join Date: Oct 2013
Location: Phoenix, AZ
Posts: 99
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by Chalkboss
Just did all my lines in the engine bay. Had one very slight seepage at the front regulator to supply. Loosened up, re tightened and that did the trick. Dont go gorrilla on these fittings. Please check all the rubber lines as they can look ok but be badly cracked and hardened. Mine were, but taking a casual glance looked fine at first.
Replacing the fuel lines was one of the first things that I did. The seepage began after I replaced the injectors.
Old 12-20-2013, 11:07 AM
  #12  
928newb
Advanced
Thread Starter
 
928newb's Avatar
 
Join Date: Oct 2013
Location: Phoenix, AZ
Posts: 99
Likes: 0
Received 1 Like on 1 Post
Default

I think that I have some permatex 51813 anerobic sealant left...I used it on the rear man crankshaft bearing when I replaced the main seal of my Jeep. It seems to have similar properties as loctite 574.
Would that do the trick?
Old 12-20-2013, 02:40 PM
  #13  
Speedtoys
Rennlist Member
 
Speedtoys's Avatar
 
Join Date: Sep 2010
Location: Boulder Creek, CA
Posts: 13,582
Received 1,034 Likes on 623 Posts
Default

Originally Posted by 928newb
Replacing the fuel lines was one of the first things that I did. The seepage began after I replaced the injectors.
Ah..then loosen the HW up, and re work it.

I dont think sealant is a fix, where the HW should seal perfectly.
Old 12-20-2013, 04:20 PM
  #14  
M. Requin
Rennlist Member
 
M. Requin's Avatar
 
Join Date: Mar 2007
Location: Central Virginia
Posts: 3,625
Received 60 Likes on 39 Posts
Default

^+1



Quick Reply: Small fuel rail leak



All times are GMT -3. The time now is 08:27 AM.