Technical Aluminum gas cap needed

Bought a SAE thread gauge , it measures 16 Threads per inch. Rock Valley stated they only manufacture with 12 threads per inch.

 

12,16 and 18? Three different pitches for the 1 1/2 size? That seems odd.

 

The cap needed is Two and a half inches with a thread of 16 Threads per inch, SAE. Sorry for any confusion. It is an aluminum cap with an "O" ring inside.

 

If you need to get one made see if there are any trade schools near you. Somebody there may need a project to get a grade by the end of the year.

 

Right, but you said to other people quoted 12 and 18 threads per inch. So one of them has an odd thread size. If yours is SAE then the other choice would be USS. So what would the third one be? Not that it matters as far as your issue is concerned.
Good luck.

 

That is a thought, as I'm having no luck with machine shops in the area. They claim they don't have the "tooling".

 

That is code for: "We don't feel like dealing with you."

 

Thanks, the third one would probably be Metric. I am not a machinist, just guessing.

 

That is true. Running out of options here.

 

How about this?

http://www.carbuildersolutions.com/uk/2-12-16tpi-modern-classic-fuel-cap-polished-alloy

 

Or:
http://www.jegs.com/i/Meziere/680/PN6500/10002/-1

 

Just gave you two. The second one is $23.69+s&h.

 

That one is a little more (~$112.00@CER), and is in:
Redlands
Lindridge Lane
Staplehurst
Kent
TN12 0JJ
United Kingdom

You'd have to check on international shipping.

 

Oh and the best part about the cheaper one:

 

That one seems pretty cool, and don't have to mess with unscrewing and screwing evrey time you put gas in.

 

Hope it works, ordered one, find out Friday.

 

They said they could make the cap but to make it worthwile for them and me they would have to make a minimum of 50 caps.

 

Excellent!

 

It is a vented cap, I need a non vented cap to keep the fuel from making a mess of the sheet metal, Appreciate the info .

 

Water will not get the gas fumes out of a tank! You must purge all the oxygen out of the tank. After cleaning just use a argon or Argon/Co2 mix or purge with a Co2 fire extinguisher before you weld. If it's a stainless tank hook a argon hose to the fuel line and back purge it while you weld. I have done a lot of them this way . Can you shorten the neck and retread it to a corse thread? Just trying to be helpful.

 

Definitely not going to be doing any welding on the tank. The neck could be shortened and possibly re-threaded, but , I have a possible solution on the way that should be here Friday. If the cap works, all will be well. Appreciate the info.

 

Dry ice dropped into the tank , while welding works wonders . Done it many times welding LPG pipelines , dry ice melts nothing to clean up , and nothing to ignite in tank while vaporing off into C02 gas


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Appreciate the info, there are options.

 

Received the gas cap from Jegs today. IT FITS PERFECTLY !!!!!. Immediately called them back and ordered two more as spares. Thanks to everyone for info and input. Joe..

 

Nice!! It's always cool when something actually works out like you want it to!!

 

I like the dry ice because it keeps the purge going when welding.