If it's a pin hole(s), JB weld will seal it up fine, I've done it myself.
Since it is corroded it will certainly be rough enough to stick well.
Spreading the JB over the corroded metal should prevent further corrosion
too.

"Denny B" > wrote in message
...
> How can one repair a small hole in the gas tank filler pipe?
> There is a square rubber gasket when you look under the
> vehicle that circles the pipe where it comes through the inside
> of the fender.I guess this gasket is to prevent muck from getting
> into the fender well.
>
> Over the years as muck has stuck to this gasket it has corroded
> the gas filler pipe. If I know what I observe now, if one went
> to the plumbing store and got a 3 inch rubber collar with end clamps
> and put it around the filler pipe where it comes through the rubber
> gasket this probably would not have happened.
>
> By the way I have purchased this type of rubber collar, slit
> it down the middle to pet it around the pipe and fitted the end
> clamps. This has almost solved the leak but not 100%.
>
> Has anyone an opinion if JB.Weld will hold, if I clean the pipe first
> then scuff the metal with a scuff pad?
>
> Your assistance appreciated.
>
> Thanks in advance
> Denny B
>
>
>