What next? Fuel leak. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-18-2006, 03:57 PM   #1
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Default What next? Fuel leak.

So this has been an interesting few weeks with the Bonneville. I have had Check Engine lights, hard starts, electrical problems, a rough idle and god only knows whats next. The check engine light was related to the EGR system. I pulled and cleaned the EGR which worked for a little while, then the light came back. Due to the random nature of this problem, I assumed the EGR itself was probably working and that I had a vacuum leak. I found a loose vacuum line on the throttle body, tightened that back up and the light has stayed off since. Hopefully it was just that easy, although I found that my MAP sensor is damaged this morning as well. My guess is that that is the root of the problem. My electrical problems that I posted about before came to a head when I went out and tried to start the car one morning and got no love. No lights, no cranking, just nothing. There was a feeble dinging coming from the dash, it sounded pretty sad. So I assumed that the battery had gone bad, got out, tested it with a meter...and found 12.4 fully charged volts. I checked the connections at the battery and every ground I could find, and they were all good. Just for good measure, I undid them and retightened them. Got in, and tried to start it, and it fired right up. All my electrical problems have since ceased. I don't know which one was the bad connection, but something wasn't right. So now we are too the hard starts. I thought this might be related to the other problems, but it turns out this is yet another unrelated problem. The car would start, but not without cranking for a while. I checked the fuel pressure after it sat overnight this morning and found what I expected: 0 psi. I allowed the pump to prime the system, it shot up to 35 psi...and promptly started to fall. In under a minute it was down to 10 psi and still falling. That was when I smelled gas. I went into this expecting a leaky pump or injector. It turns out, there is a fuel line leaking. It is the primary line that runs from the pump to the fuel filter. It is leaking at the quick connect fitting where it meets the metal line from the pump. So, now that this novel is out of me, here is my question. These quick connect fittings, are they prone to leaks? Is this line a known problem spot or am I just lucky?

Cliff notes: Leaky fuel line from tank to fuel filter, is this a normal problem and if so, what is the usual culprit?
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Old 03-18-2006, 06:14 PM   #2
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I'm assuming the problem is somewhere in that fitting at the fuel tank, but I can't 1) get my hands in there to disconnect the line or 2) unclip the retainer clip that holds the 3 lines that are running back there. Is there some trick to that clip?
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Old 03-18-2006, 08:54 PM   #3
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I had a similar problem...it seems the sendor unit on the gas tank is prone to corrosion and then leaks. See this thread for more details;

http://www.bonnevilleclub.com/forum/...ic.php?t=47811

Cheers,
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Old 03-19-2006, 03:06 AM   #4
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In this case, the metal fuel line above the nylon quick connect fitting was dry. The leak is absolutely starting at the fitting then flowing down the line. I finally got that line off tonight after drafting my wife and her smaller hands to get into the area I couldn't get to. I will inspect the area better tomorrow to find out why it was leaking. There is no visible corrosion on the metal line and no obvious cracks in the nylon line. It could just be a bad seal or o-ring at the fitting. I hope so, what with the exhaust running right by that tank, it would be a bitch to drop.
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Old 03-19-2006, 09:42 AM   #5
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Quote:
Originally Posted by TheEngineer
In this case, the metal fuel line above the nylon quick connect fitting was dry. The leak is absolutely starting at the fitting then flowing down the line. I finally got that line off tonight after drafting my wife and her smaller hands to get into the area I couldn't get to. I will inspect the area better tomorrow to find out why it was leaking. There is no visible corrosion on the metal line and no obvious cracks in the nylon line. It could just be a bad seal or o-ring at the fitting. I hope so, what with the exhaust running right by that tank, it would be a B**** to drop.
I just did a fuel pump recently and it'* not so hard to drop the tank a bit. Just back the car onto ramps, remove the bolts for the rear exhaust hangers, and loosen the tank bolts. If the leak is in the fitting from the tank to the fuel pump, return and vacuum line, it should be easy to get to then.

As I'm in California, they weren't rusty at all. If yours are rusty, a squirt of WD40 should help out.

I'd say a half hour with access, which you will have, will do it. Good luck.
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Old 03-19-2006, 01:35 PM   #6
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Yep, this car has never lived in a salt state, which I suspect is wht causes the most corrosion on those lines. The metal lines as far back as I can see them look as good as new. The nylon line does not appear to be cracked either. Does the dealer sell a seal kit for the quick connect fitting that includes new o-rings? All of the seal pieces fell out when we got the line off so I'm not even sure what order it all goes back together. There is a black plastic piece with a groove around it, a grey plastic piece and 2 o-rings.
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Old 03-19-2006, 02:57 PM   #7
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I believe some members here have mentioned that those fittings are available at NAPA parts store. You might take them down, show them to the counterman, and see what you can come up with.

Good luck.
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Old 03-19-2006, 04:02 PM   #8
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i'm seeing now on closer inspection, all those seals are supposed to be part of the nylon hose. I guess I should just need to replace this section of nylon line and it should be as good as new. Unfortuantely, I would bet this is a dealer only part. Than translates to expensive as hell.
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Old 03-21-2006, 02:14 AM   #9
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Have you read this.

http://www.clubgp.com/newforum/tm.as...de=&*=#2825935

There was a picture of two yellow o-rings out of a fuel line fitting and one of the o-rings had cracks in it.
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Old 03-21-2006, 07:31 PM   #10
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its weird cause when i had changed my fuel filter a while back i had this same problem of fuel leakage near the tank. But i dont think my solution will help much here, because we would turn the key forward and it would just leak so we left it for a few hours and when we came back it just miraculously stopped...my father and i think it might have been from the fact that we were movin the lines back and forth and it just snapped back into place...but anyways have been checkin it ever since and no leaks
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