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Old 03-24-2014, 10:58 AM   #11
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Quick update...

Engine off while fueling = no overflowing gasoline so that'* good.

Replaced gas cap = still have the "Check Gas Cap" warning and SES light. Only driven 1-2 times since then though and didn't have the code reset with scan tool (yet). I've been out of town and not driving the Buick the last few days, so I'll pull the (-) battery cable tomorrow to force a reset and see what happens with the code.

On a related note, is there any way to remove the plastic lanyard from the factory gas cap and affix to this new aftermarket one?

On my Bonneville there was enough flexibility in the ring of the lanyard that went around the gas cap to pry it off. I don't know what your after market one looks like to know if the ring will fit your new one.
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Old 03-26-2014, 07:12 PM   #12
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did you check that part I told you to check and see if you can feel it pulsating ????
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Old 03-29-2014, 04:47 PM   #13
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remove the engine cover and get the engine up to operating temp....you will see a small black round canister right in the center of the front of the engine with an electrical connection and rubber hose..put your finger on it and see if you can feel it pulsating...if not replace
I'm checking this out today, while changing the oil and removing/cleaning the throttle body. I'll post my findings.

What is that part anyway?
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Old 03-29-2014, 07:28 PM   #14
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Alright I found the mystery pulsating part "with an electrical connection and a rubber hose" (and yes it is pulsating) but only after finding the rubber hose completely busted off where it attaches to the throttle body...




Once I had the engine cover off and engine running, I could hear the hissing air and tracked it down. I'm guessing that'* the actual problem causing the gas cap warning.

Then after I followed the air line back to the pulsating thingamabob and attempted to remove it (the air line), the rubber elbow snapped off completely. So I think I need to replace the entire line + both ends of connections that run from pulsating thingamabob to the throttle body. What'* that called, and does it come in one piece?



Thanks again!
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Gas cap error - gas spurting out fill spout-dsc05885_zpse44aa8c7.jpg   Gas cap error - gas spurting out fill spout-dsc05884_zps80408234.jpg  
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Old 03-29-2014, 08:30 PM   #15
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can you join the pcs together with small pc of rubber hose ?
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Old 03-29-2014, 08:33 PM   #16
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Not anymore because it'* basically broken on both ends now... at the throttle body end (the first photo I have above), and also at the rubber elbow on the opposite end.

Can you tell me the name of that pulsating thing?? haha. That will probably help me find the replacement line.
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Old 03-29-2014, 08:45 PM   #17
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^^ Nevermind. Some Googling got me to this 3800 V6 Engine Sensor Diagram (very helpful by the way).

So it looks like I need a vacuum line to the Evap Purge Solenoid. Rock Auto calls it the Vapor Canister Purge Valve if I'm looking at the photo correctly.

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Old 03-29-2014, 08:51 PM   #18
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its a fuel vapor purge valve
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Old 03-29-2014, 08:56 PM   #19
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In an 11-year-old thread on this forum, it'* also referred to as a Modulator Valve. After reading that thread, I wonder if it would be easier to fabricate my own replacement line....
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Old 03-29-2014, 10:19 PM   #20
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junk yard
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