What is this part?

[AustinKalb]

It came with my new 2023 diesel Gladiator. It’s a mopar part and has the word “Diesel” embossed on it. An adapter, but why?

I'm new to diesels. I thought if the nozzle doesn’t fit it’s the wrong gas. At least that’s how it works in the aviation world.

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[Unkle Luk]

There are still a lot of diesel nozzles out there that are not the right size and will not open the discriminator on the filler neck, this allows you to open it for that or using fuel cans Etc.

 

[fourfa]

+1 to above. Look carefully in the fuel filler neck - there's a mechanical flap device in there called a "discriminator" which is meant to prevent you putting a smaller-diameter gasoline nozzle in by accident. Diesel pumps are SUPPOSED to use larger diesel-specific nozzles that unlock the flap, but things wear out and get mixed up - so someday you may come across a gasoline-sized nozzle on a diesel pump and be unable to open the flap. Funnel to the rescue.

I use my funnel routinely with external fuel cans. Neither the pour spout nor the soft rubber siphon hose I use will trigger the flap mechanism.

You might think to use the funnel to enable filling with the giant-diameter fast fill nozzles meant for big rigs - be ready to get soaked in diesel if you do. You'll have to go very, very slow and careful with those nozzles if you have no other choice. (Or, there's a thread on removing the discriminator entirely, so you can use the big rig nozzles if you want to)

 

[Chuck]

Use it to add fuel additive to each tank of fuel

 

[AustinKalb]

Use it to add fuel additive to each tank of fuel

Wow. I know nothing of this “fuel additive”. Do you mean DEF?

 

[Free2roam]

Wow. I know nothing of this “fuel additive”. Do you mean DEF?

No Hot Shots EDT every tankful. Lubricity for the pump adds cetane as well.

 

[djdannis]

Does anyone have the part number for this? My used JTRD didn't come with one. Thanks

 

[fourfa]

@djdannis Do yourself a favor - get this instead. The Mopar cone is not all that great in practice. This diameter adapter from VW is much more useful IMHO.

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