Fuel shut off valve/gas tank?

[1929]

the riveted base plate that is riveted to the tank, where the fuel shut off screws into, has I think 3 rivets, one has a slow leak, I guess the one choice I have is to get it welded.

[CT Jack]

If the leak is very small you could try sealing it in place of welding. Drain the tank completely and wipe the area with mineral spirits (paint thinner). Remove all paint around leak area and scuff with 100 -220 grit sand paper. Wipe with denatured alcohol. Mix a small batch of clear 5 minute or 30 minute 2 part epoxy and apply a slightly heavy layer to the area. Let epoxy cure/harden for a minimum of 8 hours. If possible place a lamp close to the patch. This will help speed curring time. Fill tank and check for leaks. If there are no leaks paint can be applied over epoxy. If sealing doesn't work then go the weld or braze route.

[Kurt in NJ]

originally it was soildered, if you weld on it you will have lead fumes

[H. L. Chauvin]

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Posted this years ago ..... had leaking Sears riding lawn mower steel gas tank made in two pieces and soldered together.

Gas tank appeared to vibrate about 1,000 more than any Model A gas tank.

Tank started leaking on bottom at soldered joint.

Cleaned metal joint until "shiny", mixed & applied (2) part epoxy and it never leaked afterwards.

Try calling "any" epoxy manufacturer's chemical technician and one will hear the same old tune;

i.e., about 99.999999999999999999999% of all epoxy repair failures and all J.B. Weld repair failures are caused by "NOT" removing "all" grease, oil, gas stains, rust, paint and other deleterious materials from the metal surface "all" of which prevent structural adhesive bonding.

As usual, most people never listen ..... they always do a half-fast job cleaning and later report about why their product failed ..... these same people can never make "light" homemade bread either ...... they never understand the recipe and try it their way .....

and thank God these people never go to Dental School where epoxy repair is a 2016 medical repair way of life .... we would see tooth cap repair glue sold in every restaurant.