Triumph Daytona T100R
Triumph Daytona T100R
1 month ago

Fuel Tank Part 5

After I posted the above, I got a couple of messages that I had overlooked one potential source of leaks. The way I plugged the filler neck with an expanding stopper put the filler neck joint outside the pressurized area, so a leak at the neck would not have been detected. Of course, this is correct. Here is the construction of the filler neck joint:

In thinking of ways to repeat the pressure test, I decided that sealing this joint would be a good idea whether it was leaking right now or not. First, I cleaned up the accessible parts of the joint.

Then soldered it:

I had all the stuff out, so I soldered around the base of the neck, too:

To pressure test, I saw problems in just using a gas cap on the neck. Even plugging the cap vent, the spring loaded cork washer didn't seem positive enough, and besides, it would be hard to check for a small leak around a gas cap. I ended up bonding a metal disk over the top of the filler neck with RTV. The five-pound lead weight balances the internal pressure to reduce the stress on the RTV joint.

The tank went over night with no detectable loss of pressure. Now I think I'm ready for prep and paint,

0 306
Comments
No CommentsNo Comments yet. You can write the first
Please Log In or install the app. Comments can be posted only by registered users.
Related
Home
Menu
Posting
Notify
Sign In
Profile
Content creation
Search
See More