Dorman 579-003 Fuel Tank Sending Unit Lock Ring Compatible with Select Models
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I bought it for a mustang gas tank and don't know how big it is.
There was only one o- there was only one o- there was only one o- It's a square-cut ring, not a round one. On a 1980 CJ7, I used mine. It's not quite ready to drive yet, but it's a good fit. I won't know if it seals for a long time, and I have no idea what diameter it is. I apologize for not being of greater assistance.
Selected User Reviews For Dorman 579-003 Fuel Tank Sending Unit Lock Ring Compatible with Select Models
Because of a pressure leak in the fuel tank, I failed my California SMOG test. I discovered that the locking ring for the sending unit was made off center and was not holding on one side when I removed the fuel tank; it must have barely held on when I put it together the first time and then lifted it on one side after I reinstalled the gas tank due to vibrations. I bought a new lock ring on Amazon. Let me tell you, the quality difference and safety features this simple ring has were obvious as soon as I took it out of the bag. There are three raised sections that keep it centered and prevent it from twisting too much. It also has bends to keep it in place. I've attached a photo of my old one, which came with the sending unit, to show how it was punched off center.
The gasket is about the same thickness as dental floss. I believe this is the most dissatisfied Dorman part I've ever bought.
A fuel tank seal and lockring are included in this package.
On my 1968 falcon, it worked perfectly.
It fit.
There are many on the market, but the Dorman one was the best fit.
My main tank from a 1973 Bronco fit perfectly.
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