fuel tank sender gasket

[flyinlow]

I installed a new tank in the '73 last summer. I installed an in tank FI pump in it. I still use the stock sending unit. The original thick gasket was starting to deteriorate so I used the one that came with the new sender. It appeared thinner. I used sealer with no problems for awhile. With the season coming to an end in Ohio I filled the tank. Its leaking. 

Where can you get a original thickness one?

[cdr]

Also the aftermarket lock ring is junk,that is what lets them leak MOST of the time.

[ODZKing]

I installed a new tank in the '73 last summer. I installed an in tank FI pump in it. I still use the stock sending unit. The original thick gasket was starting to deteriorate so I used the one that came with the new sender. It appeared thinner. I used sealer with no problems for awhile. With the season coming to an end in Ohio I filled the tank. Its leaking. 

Where can you get a original thickness one?

Try DMT, all of their stuff I've gotten has been good. However I can't speak for the sender stuff.
This is the filler grommet. You may have to call them.
https://www.detroitmuscletechnologies.com/mopar-b-body-70-e-body-70-74-fuel-gas-tank-grommet-3404182/

[jlatessa]

CDR is right on the locking ring, no comparison to the OEM.
Really wrestled with the replacement ring, found the old one, cleaned it up and good to go.

Joe

[green69rt]

Also the aftermarket lock ring is junk,that is what lets them leak MOST of the time.

When I bought my new sender, I compared the old lock ring to the ring that came with the sender.  The new one was thinner and so, I would guess, puts less pressure on the gasket or distorts as you install it.  I ended up using the SS lock ring that came with my tank (SS tank) and it matched the old one and worked fine.  I didn't even try the one that came with the sender because I heard about the problems people were having.

A lot of the senders come from Spectre (sp?) so may have the same problems.