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What is this noise? What is this noise?
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  #11  
Old 11-27-2016, 04:54 PM
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How is your fuel tank filler cap? Is it difficult to remove? Asking in case your fuel tank has a vacuum...or other issue related to the previous suggestion about the vapor LDP.
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  #12  
Old 11-29-2016, 01:26 PM
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Quote:
Originally Posted by Qsilver7 View Post
How is your fuel tank filler cap? Is it difficult to remove? Asking in case your fuel tank has a vacuum...or other issue related to the previous suggestion about the vapor LDP.
It didn't seem that difficult to remove after I tested when I parked last night. However, I believe I heard a change in pattern of the knocking noise once I did this. I will continue to experiment to see what effect removing the fuel cap has on the noise after I park....
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Old 11-29-2016, 02:40 PM
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Quote:
Originally Posted by nikolai View Post
Certainly sounds plausible - no check engine light though, so it's still working OK I guess. I'll have to investigate it more, thanks!
Check OBC for code.
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Old 11-29-2016, 03:18 PM
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Originally Posted by bcredliner View Post
Check OBC for code.
I did, and there was a P0460 code, which I think is related to the fuel level sensor - when I fill up my tank all the way, the sensor does not work properly and reports less than a full tank. This has not tripped the CEL though, and I'm not sure that it's related at all to this noise...
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Old 11-30-2016, 02:42 PM
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Yes, P0460 is fuel sensor code.

I can't open your file so I haven't heard the sound. Might pull the back seat and listen to see if it is coming from the fuel pump.
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