FIXED! -- Fuel Smell? No Visible Leaks.. Ideas? - 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.

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Old 04-14-2008, 03:23 PM   #1
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Default FIXED! -- Fuel Smell? No Visible Leaks.. Ideas?

Hey everyone. Not sure if you remember or not, but I just put a low mileage L36 from a 2000 lesabre into my 96 bonneville. Everything went fine except for a power steering issue which was solved. I've put about 120 miles on it so far and it runs great, except I keep smelling fuel inside the car. I've obviously searched around both fuel connections on the rail and under the car and not seen any visible leaks. I've also checked to make sure the cap was on right. lol. The only thing I can think of that I haven't checked yet is the vacuum line on the regulator to see if it'* sucking fuel or something. Can anyone think of anywhere else where I might be getting the fuel smell from without seeing any visible leaks or drops under the car? Also, It'* went through about 3/8s to a half of a tank in just these 120 miles, but I haven't filled the car up yet to know how many gallons that is.
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Old 04-14-2008, 04:09 PM   #2
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i've seen a pin size hole in the plastic part of the fuel line that plugs into the fuel rail. Just enough fuel squirts out while the pump is running to smell. Turn the key to "on" which will pressurize the line and start looking.
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Old 04-14-2008, 05:54 PM   #3
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check the fuel vapor line going to the charcoal canister..they are known to break by the tank and the fumes seem to find air leaks going into the interior.

check out these pics of my 95 SSE fuel pump job...look for broken vapor line...
http://www.putfile.com/album/181337
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Old 04-14-2008, 06:18 PM   #4
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I can't see pics at work, but I didn't even think about the vapor lines. I'll climb under there tonight and take a look. Appreciate the tips everyone.
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Old 04-15-2008, 10:30 PM   #5
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may not be likely, but, from a safety, and avoiding an exploding intake standpoint, you may want to take the vac line off the pressure regulator to make sure its not leaking through there.
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Old 04-17-2008, 05:48 PM   #6
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I ended up finding the leak. It wasn't leaking all the time, only once in a while. It was actually leaking through the feed line where it connects to the rail. I'd checked it two or three times already and didn't see any fuel around it or coming from it, but I ended up touching it just right and it started dripping furiously. My thought is that when the motor torque'd and moved it wiggled it just right enough to leak. I've since replaced the orings inside of the hose and for the last 2 days I've been leak free. Thanks for the suggestions everyone.
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Old 04-17-2008, 06:03 PM   #7
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Love the easy (cheap) fixes
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Old 10-21-2008, 10:33 PM   #8
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Oh my God Toddster! What on Earth is picture 14 (Service Day #008 ) and should I be worrying about that on my car?!

Last edited by Torch; 10-21-2008 at 10:34 PM.
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Old 10-30-2008, 02:05 PM   #9
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Hey I'm curious ....Did you ever throw a P0171 code while this gas leaking was going on? My 96 SE does throw a 171 from time to time and recently I have noticed a very small amount of gas leaking on the connector at the rear fuel rail.(is that the retun line?) I think that low fuel pressure can cause a 171..at least it did on a Dodge mini van of mine. I think I need to change some O-rings in the connector to stop my leak.

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