Quick Q's on fuel line connection to fuel rail on S/C - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 10-10-2009, 06:45 PM   #1
Senior Member
Posts like a Northstar
Thread Starter
 
charliemax's Avatar
 
Join Date: Jan 2006
Location: Valley Forge, PA
Posts: 598
Thanks: 0
Thanked 0 Times in 0 Posts
charliemax is on a distinguished road
Default Quick Q'* on fuel line connection to fuel rail on */C

When I power up my fuel pump, it goes to 50+psi (where it should stay until I actually turn the car over) and I immediately hear a hissing noise. The sound of pressure being released, and the fuel pressure gage drops to the 40s and holds. I thought it was the EVAP purge valve, but its actually coming out of the main fuel line where it connects to the fuel rail.

First, I'm assuming this is not good, and want to fix the connection. And I don't want to screw up any parts while I'm getting this off.

The connection looks like a metal version of a quick-clip with another type of clip involved, holding it on the rail.

First, is the metal "quick-clip" part of the rail or the fuel line?

And how do I get this tenderly disconnected? (There isn't a clip left in the automobile industry which I haven't ruined trying to get it off.)

Thanks for any help.

.
charliemax is offline   Reply With Quote
Old 10-10-2009, 06:52 PM   #2
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

If you have a fuel leak you will see the fuel spraying out, do you see this? If not, then you don't have a fuel leak. Check the FPR, pull the vacuum line and smell it, do you smell gas?
Danthurs is offline   Reply With Quote
Old 10-10-2009, 08:01 PM   #3
Senior Member
Posts like a Northstar
Thread Starter
 
charliemax's Avatar
 
Join Date: Jan 2006
Location: Valley Forge, PA
Posts: 598
Thanks: 0
Thanked 0 Times in 0 Posts
charliemax is on a distinguished road
Default

Quote:
Originally Posted by Danthurs View Post
If you have a fuel leak you will see the fuel spraying out, do you see this? If not, then you don't have a fuel leak. Check the FPR, pull the vacuum line and smell it, do you smell gas?
Danthurs...

That'* what I don't get. there is no fuel smell coming out of "the leak" only air. And I can do this over and over again in one sitting. One right after the other.

Another symptom I forgot. If I leave the fuel pressure gage connected to the rail after I turn off the car, within an hour or so, it drops from 40+psi to practically nothing.

I already replaced the fuel pump. the "check valve" is in the pump. I really didn't like how the pulsator connected the fuel line to the pump (on all other fuel pumps there is tubing with clamps on it) . It seemed not very secure. that'* the only connection where fuel could flow back and not be seen or smelled.

But for the fuel to recede (it can only be going back to the tank) or just lose pressure, we need a leak somewhere in the front end of the fuel system.

Fuel is a new area for me, and one I'm going to have to learn. How do I check the FPR?
charliemax is offline   Reply With Quote
Old 10-10-2009, 08:07 PM   #4
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

The FPR is just a vacuum diaphragm. If it goes the fuel will leak in to the vacuum line. If you smell gas in the vacuum line, it'* leaking. Another place where fuel can leak is a stuck open injector. Pull the plugs and look to see if you have a blacker plug. You can pull that injector and try to blow threw it. If stuck open the air will go threw.
Danthurs is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Problems with plastic fuel line inlet to fuel rail. joshua Pontiac 3 03-18-2015 12:53 AM
1990 305 fuel pump has 3 connection what for is the small connection ? Trans68am Chevrolet 2 07-02-2010 07:41 AM
Quick fuel connection leaking at rail alexM 1992-1999 7 11-11-2009 07:56 PM
fuel rail line leak on top of supercharger knight rider 1992-1999 3 12-12-2008 07:59 AM
Replacing fuel line the run to fuel rail 94bonnie 1992-1999 3 01-02-2007 08:22 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:27 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.