The Stovebolt Site Forums The Shop Area General Truck Talk 1947 AD filler neck attachment to tank

Hi All,

I pulled the tank from my 1947 AD this afternoon to seal it. During cleaning, it became clear why the truck smelled when the tank was past half full - water was flowing out between the filler neck and the tank. The neck appears to be attached to the tank with two threaded studs with nuts. The leak seems to be at this interface.

I have not seen a gasket for this joint and the repro tanks seem to have the filler neck on them already here and here ; as opposed to the assembly seen on my truck.

So my questions are:
1) Has anyone seen a gasket for this interface?
2) In the absence of a gasket, what do you recommend? E.G. will POR-15 seal this gap?

Thanks,

Bill

Assuming you can separate the two parts you could always make a gasket,failing that i'd imagine any good quality gas resistant RTV sealant would suffice.

I have a similar issue on my repro (in cab) gas tank but as you've noticed the neck is actually welded at that point on the repops and on mine the weld is porous.
The original in cab one had a bolted two piece assembly much like the 47s under bed tank.

Rather than pull the tank and get it welded (with all the risks that involves) i'm going to wrap the join with fibreglass mat and resin,hopefully this will cure the smell in the cab.
It's only evident on fill ups and tight left hand corners depending on how much gas is in it...and how hard i'm driving it.

There are safe ways to alleviate leaks in old gas tanks.
My favorite is to buy a new one.
I just think ahead about how hard I would be on myself if my truck caught on fire one day because I was too "thrifty" to spend $200 to $350 for a new one.
Carl

That's what I did,the exterior of my original tank was perfect,the inside was another matter.
Dropped the cash on a new tank and it leaked at the filler neck.
Rather than go down the fibreglass route I mentioned previously I found "Petro Patch putty" a two part epoxy,it's worked a treat.

I've read previous posts on the successes and failures of gas tank sealants, recommended products, recommended steps to take during application, etc.

The bottom line, I'm concerned about fighting a failing sealant coating "down the road"; particularly on the road. .

Concerns about reliability won out over cost; ordered a new tank yesterday.

Thank you Carl and Jockbolter for your comments.

Bill

I see you've opted for the new tank Bill,like you say it will hopefully prevent any issues along the road and apart from the obvious safety concerns,at least you should also be guaranteed a clean tank with no internal rust/sediment issues.
One less thing to worry about!

I can't remember who manufactured mine but if your new tank has a welded filler neck,i'd be double checking it before installation just for peace of mind.
Hopefully mine was just a rogue that escaped quality control.

Jockbolter,

Your story caught my attention. I've planned a leak check before installation

Thanks,

Bill

Yeah Bill,it will save any heartache.
Mine only became apparent when I put quite a lot of gas in it (a rare occurrence here) and when turning tight left handers the fuel surged up to the filler neck.