Annoying gas tank/cap rattle under load, more like a loud buzz

[fecalpeanut]

Can't duplicate at idle, but when going to shift gears I'll hear a loud buzz from my gas tank area. It's so loud it almost drowns out my exhaust. When it happens I can reach down and feel my fuel cap rattling. Last time I got gas, it went away until I dropped to around 1/2 tank of fuel. The cap seems solid and the seal is there. I wonder why it would stop when the tank is full. Any ideas?

 

[Rottweiler]

Is it just your cap or is the whole tank moving? Make sure your tank bolts are tight.

 

[HMAN]

There is a smaller diameter tube in the filler neck. Its been known to break loose and rattle around. Some folks choose to break it completly and pull it out. Ck the tank bolts too.

 

[Mr. Wright]

Also check your upper motor mount bolts. But if it is the vent tube loose, this is how I fixed mine. Grabbed it with some needle nose pliers and ran a screw beside it. It was still that was thousands of miles later when I sold the bike.

 

[mittens]

My 04 chopper got the rattle, removing the vent tube fixed it. grab it and pull it all the way out.

 

[fecalpeanut]

Thanks guys! I'm gonna check for that tube when I home.

 

[fecalpeanut]

I was in there trying to grab that tube and I grabbed and ripped what looks like a fuel filter bag/sock. Should I rip this thing out too?

 

[mittens]

Think thats a liner? but looks like already ripped

 

[fecalpeanut]

Must not be too important. Never could get a good grip on that tube. The inside of my tank needs attention. Damn chopper... ‍

 

[SCC007]

Looks like tank liner is sluffing off, you will need to take care of that asap. It will start breaking into smaller parts and plug up everything: carb jets, petcock screen, and any filter you may have. There are some good posts on here about how to do it and also some youtube videos.
When you clean it, you will have to drain the tank and take it off, you might be able to identify what's rattling but I have found more then a few bikes that the wiring and connectors were making contact under the tank creating some fun gremlins (both sound and eventually power) to try and chase down.

 

[fecalpeanut]

Dropped off over a week ago to get tank liner issue fixed. I'll bet that rattle will be gone too after pulling the tank and re-installing. I just sold my Fury about 3 weeks ago, so now I'm in tears sitting around with PMS(Parked Motorcycle Syndrome).

 

[SCC007]

PMS sucks!

 

[Rottweiler]

PMS sucks!

I agree
That is why I have three.