I need a good long lasting gas tank filler neck grommet for my 1966 Dodge Coronet Deluxe, which company makes a good one
I bought a new Spectra gas tank for the car and ended up trying to use a grommet I bought from year One years ago, it leaked and I order a new one from the company I bough the tank from. I installed it around two year ago and it is leaking now
Any and all help on this is greatly appreciated, THANKS in advance

timely question cab, as i need one for the new tank i bought for my charger.
i'll be watching this closely.

Not a Coronet, but for my 1971 Barracuda, I bought a Mopar NOS grommet from Brad's NOS Parts for $30.00. I also bought a reproduction from Detroit Muscle Technologies for $10.00. Both made in USA. After I compared the two of them, I would not hesitate installing the repro on my new Spectra tank.

Both companies sell on Ebay.

David

There's been some issues in the past with the repops where the melt once exposed to gasoline .

No idea if thats still the case or not

I bought one from 521 Restorations about 4 years ago. No problems so far.

Don't think you will have that problem with this one. It is made out of Buna-N / Nitrile rubber. Read the description. You can email Jim (the owner) and he will answer any questions you may have.

https://www.ebay.com/itm/Mopar-A-B-C-Body-64-74-Fuel-Gas-Tank-Filler-Neck-Tube-Rubber-Grommet-Seal-DMT/360963621791?hash=item540b1bc39f:g:wi4AAOSwDDxa2VwM:sc:USPSFirstClass!35243!US!-1

Jim is also a member here. Or simply call him here https://www.detroitmuscletechnologies.com/

Jim at Detroit Muscle Technologies is a long-time member here. Maybe he'll chime in. Funny, with all the leaks in my build, the tank is not one of them. I can't recall where I got my fill neck grommet.

I received a new gas tank filler grommet form Quantum yesterday, it isn't any different looking that the ones I've already used that failed
I'm going to call Jim and ask him if his are better than this one or not
I called a bunch of different vendors today looking for a premium one that will last longer than the ones I'vr bought and used so far, no luck DANG IT

https://board.moparts.org/ubbthread...ronet-gas-tank-problems.html#Post2200745

Get the Mopar OE part number 3404182 mentioned in above thread. It is longer and seals better.

This ^

Regardless of who is selling the repops, ( And unless somethings changed since I was a retailer that Im not aware of.) They are all made by one vendor , thus all have same issues ( be it good or bad )

in 2000, i bought a tank grommet from my local dealer, as it was still in the system.
is the above pn still dealer available ? or do i have to search for NOS ?
the old tank is still attached to the car, full of old 2006ish gas. wonder if the old [new in 2000] grommet is still usable ?

Any dealership can order or you get online.

https://www.ebay.com/itm/BRAND-NEW-OEM-MOPAR-FUEL-FILLER-NECK-GROMMET-DODGE-CHALLENGER-PLYMOUTH-BARRACUDA/362664730869?hash=item547080a0f5:g:h4EAAOSwp5Vc7wEd

thank you john. great to know they are still available OEM. i will definitely go this rout.
those things must have been used in a TON of vehicles up to pretty early in the fuel injection years. anyone know ?

Not 100% sure, but I think the grommet was used on pretty much everything with a metal tank up till maybe mid 2000's

Ive used said grommet on 1966 cars thru early 70s cars with zero issues , regardless of original oem part number it called for

I started to install the new grommet form Quantum and they sent me one mark for a 1963 to 1966 A body
It does not look like it will work, the filler hole and O.D is smaller than the one I installed originally two years ago that is now leaking and it is smaller than any of the old ones I bought from Year One 15 yrs ago

That Ebay link is to a guy that has 239 NEGATIVES and doesnt even sell in the Mopar circles?!?! In fact the link above is to an Ebay listing that ended.

There are no brand new OEM grommets. There may be a few (damn few) NOS ones but who would want a 50 year old rubber part sealing their gas tank. Like driving on 50 year old tires.

Someone mentioned only one vendor selling the same grommet. Wrong. Everyone and their Asian brother make these now. I have personally tested tank grommets that became soft and swelled within hours when put in a can of gasoline. I could NOT sell this garbage. We have our own made in Akron Ohio, the rubber capital of the world. I spot test every shipment by soaking in gasoline because accidents could happen and the wrong material used.

The other one I see and hear about from customers are the rubber elbows used on fuel filler tubes on 66-67 Plymouths. I'm shocked we haven't heard of lawsuits yet.

Buy where you want but soak in gas before installing.

how long of a gas soak do you recommend to see any adverse results ?
my local dealer says he can get them [3404182] but it would be five days out, which is no big deal.
are these reproductions as well, or super old stock ?

You should see something within an hour

thank you !