Has anyone unsoldered the gas tank filler neck and soldered a new replacement filler neck?

Looking at the photos of new replacement filler necks, the neck does not have a flange, at the tank. I am wondering if one unsolders and removes the filler neck, what will be found? Will they need to solder the pipe into a hole in the tank? Will there (hopefully) be a short, pipe protruding from the tank, to help the install?

Please AVOID the safety discussion, I am well aware of the tank purging and other safety details. Thanks, Mikeceli

 

Looking at the photos of new tank W/O filler neck and new filler neck, replacing a filler neck would be difficult.


Anyone done this R&R ?

 

I've never looked into this, so I don't know if it's possible, but since this topic has come up, I've wondered if the filler neck can be cutoff and replaced with the filler neck from a 4thgen plastic tank. Seems doable. The tanks are virtually direct physical swaps, so it should line-up well, and the flexibility would help if minor adjustments were needed.

It would make dropping the tank for pump changes easier. It could even be cutoff without dropping the tank. It may not be possible, but I'd be surprised if nobody has done it and even more surprised if nobody has thought about it, and it wouldn't be sacrilegious like cutting a trap door.

Like you said, this isn't about spillage or sparks or any other arguments people might want to make regarding safety, nor is it about how Superman can do the whole job, drop the tank with the filler neck attached, change the pump, reinstall the tank and pat himself on the back, faster than Dominos used to be able to deliver a pizza. Just the feasibility of such a modification.

 

OP here. Based on my studying the photos, the neck should slip (slight press) in up to the "accordion" area. At that point, it won't go in any further and the larger area would solder in at the hole in the tank. Thanks.

 

OP Reporting...

I used all the gas tank before welding precautions and De-Soldered the filler neck, using a propane torch.

I bought the new filler neck, cleaned it and the tank opening, and gently tapped it in with a rubber mallet. I applied soldering flux, and soldered it in using my Miller Falls Soldering Gun and acid core solder. . I found that the gun worked better than the torch.

 

yes I have, Used a copper soldering iron heated with a torch.
THE IRON WAS POINTED AT THE END AND THE SOLDER FLOWED REAL NICE.

 

i would think its brazed, not soldered.
hmm interesting

 

It was melting lead that came out with the old filler neck.