gas filler neck...
 

while blasting and cleaning up the gas filler neck I noticed a small crack were the vent is brazed into the tube (pictured).

There is no movement of the small vent tube and the braze seems solid @ the moment. Wondering if I had to repair this at some point how to go about it. Any input would be great. Scott

Re: gas filler neck...
 

Heat it up and let the braze flow to seal up the crack. My 2¢.

Re: gas filler neck...
 

That doesn't look like brass braze. Looks more like gas weld with steel rod. First thing I'd try, clean it up good and solder the crack shut.

Re: gas filler neck...
 

If you have a welding torch braze completely around the area where the vent tube attaches to the filler tube.

If you don't have a welding torch , MIG welder or TIG welder bury the area with JB Weld.

Re: gas filler neck...
 

While you have it apart whether is steel welded or brazed you can
braze it. You just can't heat an old braze to make it flow, you need
flux. I also use gas tank sealer on the lead seal. G.M.

Re: gas filler neck...
 

As I look it over and read the responses, that probably is lead. I will do the same with the tank sealer. Scott

Re: gas filler neck...
 

I doubt that is lead as it would not be very strong. Easy way to find out is to see if it will cut with a sharp knife.

Re: gas filler neck...
 

Why not lead? They solder the radiator over flow.
Plus it cracked. G.M.

Re: gas filler neck...
 

you will have to do some thing with the crack to keep it from traveling, I would use a very small drill at each end of the crack to stop it from getting any longer

Re: gas filler neck...
 

After looking at it again, I think it is lead soldered. A little flux, solder iron, & solder will fix you up as good as new. Lead is more flexible than either steel or brass for a joint like that.