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  #31 (permalink)  
Old 06-29-2016, 07:00 PM
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Quote:
Originally Posted by jedi View Post
I fixed mine by machining an "o" ring groove in the cap. Choose the right size rubber o-ring to suit.
It doesn't rattle and it doesn't leak.
Jedi: Can you give some details on how you vented the cap? I took mine to a local shop that does a lot of fabrication, and the guy refused to do it; he said he'd have to drill a hole in the top of the cap to keep it vented, and that it would geyser out the top if it was currently leaking around the sides.
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  #32 (permalink)  
Old 08-10-2017, 11:04 PM
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I know this is an old thread, but I've never solved the problem; Jedi, can you provide pics of how you vented yours?
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  #33 (permalink)  
Old 08-13-2017, 04:16 PM
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FWIW, you might be able to drill a small hole all the way through the cap, then increase the hole on top so you can slide one of these in, vent/breather units used on ATV\dirt bike gas tank caps. Their about 1.50 on ebay.

5PCS Silver Gas Fuel Cap Valve Vent Breather Hose Tube For DIRT Motor BIKE ATV | eBay

I have one on my bike
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  #34 (permalink)  
Old 08-13-2017, 05:41 PM
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Here is the only possible explanation that I see....It's obvious how it vents. Air is drawn down around the cap, down through the stem in the middle and out the holes at the bottom...reverse that for pressure blowing in the opposite direction..and of course gas drooling all over your high dollar paint. By machining a grove in the cap, would seal that vapor, and keep the cap from rattling etc.....but as far as your vent??? it's sealed....it may possibly still vent if the o ring is barely tight...and still allows air to enter and escape, and may alter the escape of vapor, other
than on the tank..anyone see anything different?

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  #35 (permalink)  
Old 08-13-2017, 08:24 PM
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Quote:
Originally Posted by Shovel52 View Post
Here is the only possible explanation that I see....It's obvious how it vents. Air is drawn down around the cap, down through the stem in the middle and out the holes at the bottom...reverse that for pressure blowing in the opposite direction..and of course gas drooling all over your high dollar paint. By machining a grove in the cap, would seal that vapor, and keep the cap from rattling etc.....but as far as your vent??? it's sealed....it may possibly still vent if the o ring is barely tight...and still allows air to enter and escape, and may alter the escape of vapor, other
than on the tank..anyone see anything different?

Another guy suggested this, and even posted his pics... problem is that I took my cap to a local shop that does a lot of motorcycle fabrication and machine work, and showed the pics to the owner. He immediately said it wouldn't vent, and when I floated the idea of drilling a hole in the cap to vent, he said it would shoot gas out onto me when the pressure built up.
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  #36 (permalink)  
Old 08-14-2017, 09:53 AM
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I'm going to give this a shot...But first I want to experiment with a couple of layers of teflon tape to see if I can get a feel for the vent...hopefully it will still vent.........

Ok...4 hours later and I did try this and ...yes 100%....it works..the tank is still vented..and I filled up to the brim and no leaks..amazing..don't bank on anyone in a shop.....The teflon tape would work by it's self....I think if I disasembled my cap I could just chuck it up in a drill and cut a groove..
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  #37 (permalink)  
Old 08-15-2017, 12:30 AM
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Keep us posted. My next concern would be that it's unable to vent air into the tank and will create a vacuum so that fuel won't make it out of the tank.
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  #38 (permalink)  
Old 08-15-2017, 07:01 AM
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As I posted above, there is no problem there since I took it for a ride ..It is venting...I guess it is just sucking air through....just one of those things you have to try...I suggest trying the teflon tape first , mine took about 10 turns, just so you can push the cap down and it won't pop back up with out locking...Where did you get the picture of the gas cap above?..........evidently it vents for them too.........Jedi also..
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  #39 (permalink)  
Old 08-15-2017, 07:54 AM
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One of the guys here... or on another board, I can't remember.
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  #40 (permalink)  
Old 08-23-2017, 04:36 AM
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Do me a favor, shovel52: screw the cap down, then back it out a turn, then just push it down and turn just enough to lock it down, and see what you get. Somehow that has been working for me for the last couple of weeks.
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  #41 (permalink)  
Old 08-23-2017, 04:47 PM
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Yes , that is the procedure that I have been using..I always back it off a turn or so before I lock it , It seems like it leaks less gas when I do that, but it still leaks, and I still cant fill to the top...However I have been riding with the teflon tape wrapped around the top and it doesn't leak a drop, so i will be doing the procedure with the o ring shortly..
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  #42 (permalink)  
Old 01-09-2018, 01:33 AM
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Well, Shovel, fate forced me to fix this problem a whole other way. Back in October, some wench backed into my bike while it was parked. Damage was to the tank and front fender, not to mention a number of chrome parts.
I employed a very good painter, who retired as an aircraft painter after 30 years. He stripped it down the metal and found that the guy who did my sheetmetal originally welded like a toddler and, as a result, there was literally 1/4" of bondo over the metal to hide the poor welding job. Even more, he showed me where the primer showed signs of fuel contamination in small spots, indicating that the integrity of the welds were compromised. He suggested I scrap the old tank and start over. He suggested farming the sheet metal work to a friend of his who was a B29 mechanic who had access to a ton of metal brakes and other equipment through his employer.
Since I was getting a new tank, I asked the guy to put in an HD style vent tube, and move the bung back to the high side where I should have left it all along. (I now get twice as much fuel into the tank) and the cap has not leaked since I got it back.
It sucked, having my bike slapped on the pavement, but not only did I remedy my cap/ tank venting problems, I paid a bit out of pocket to have him redo the rear fender, too. (A friend and I had re done it ourselves and I was always unhappy with our shitty paint and body work)
In the end, he did a bang up job, and I couldn't be happier with the end result.
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Pop-up gas cap dilemma-resized_20171111_185700_9475.jpg   Pop-up gas cap dilemma-resized_20171111_185716_1788.jpg   Pop-up gas cap dilemma-resized_20171111_185735_355.jpg   Pop-up gas cap dilemma-resized_20171111_185807_3020.jpg   Pop-up gas cap dilemma-resized_20171111_190321_4720.jpg  

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  #43 (permalink)  
Old 01-09-2018, 01:36 AM
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Another cool thing is that he invited me to come over any time I wanted and check out the progress:
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  #44 (permalink)  
Old 01-09-2018, 01:37 AM
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Finished product:
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  #45 (permalink)  
Old 01-09-2018, 01:40 AM
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And a few more:
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