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I found this topic on another site and have never seen it here, thought it worth sharing.
If you haven't checked the screws on the bottom of your gas cap recently, please go out and do it! These things are notorious for coming loose and having all the guts of your cap falling inside the tank.
So I just checked mine on an /04 with 10,000KM and found them unacceptably loose, mechanic speaking. I put the red locktite to them.
 

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Gas cap screws

I have seen this post several times. And a few people fishing gas cap parts out of their gas tank. Is good info, Check those screws.

Dave
 

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As said about the carb bowl screws, these screws are soft. Replace them with stainless internal hex screws and loctite them. You can get them at an Ace hardware or the like, you won't find them at the big box stores (Home Depot/Lowes).
 

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1 screw missing, and more

Thanks for the post, I also checked mine and got about a 1/4 turn on them before tight.
When I bought my '03 silverado last fall I quickly realized that not only was one screw loose, the other one was missing. And one of the lock flanges that open and close was missing as well. Bought another cap (used) and took it apart to canibilize and used locktight to get it all tight and secure. Wonder if the missing parts are in my gas tank. How would I know? Any potential for damage?
 

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Need to do that soon.
 

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So if it has already fallen apart, how does one put it all back together? I have not been able to find a schematic for the gas cap.
 

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to fix gas cap

So if it has already fallen apart, how does one put it all back together? I have not been able to find a schematic for the gas cap.
Mine was not yet completely apart, so I had some control.
What I did was place gas cap down (screws now facing up), and carefully remove one remaining screw. there are two springs in there that will come loose and fly away, so open slowly applying a little pressure. Once open, it is obvious how it all works, and where to replace parts. If it had already fallen apart, I would have had no clue how to put it back together, unless I Got a used one and did as I described.
 
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