Need correct gas cap that fits flush

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Steve Agrella

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I purchased two of these for a 74 Duster as you can see they don’t fit so well any suggestion on where I can get a cap that fits

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Uhhh in the last pic isn't the tube supposed to be INSIDE the quarter panel ? that will pull that cap in a lot closer too. (all of mine are and so is Tinmannz)
I mentioned that in post #2. That would sure make a difference.
 
I think the filler tube should mount inside trunk on quarter panel at least on all the ones Ive dealt with. The screws is all you should see from the outside,, not the flange
 
The filler is another '73 up change, the later ones installed from the outside. The filler on my '74 Duster is mounted on the outside of the quarter.

Is that the original filler tube though? Something looks off about it.
 
My car is locked up in storage but could the fill tube flange come in from the trunk and not from outside the car?

You are right TMM, fuel neck gets put in from inside the trunk. All you see when installed are the 3 screw heads when looking from the outside of the quarter panel.

Then the gas cap will fit correctly.

So it goes like this, drop the gas tank, then position the filler neck into the quarter panel from the inside the trunk. Then work the gas tank back up at the same time working the filler neck into it. Keep filler neck properly positioned into the quarter panel from the inside, while bringing the gas tank back up to position.

Someone just stabbed the filler neck in from outside the car with the gas tank still in the car.
 
You are right TMM, fuel neck gets put in from inside the trunk. All you see when installed are the 3 screw heads when looking from the outside of the quarter panel.

Then the gas cap will fit correctly.

So it goes like this, drop the gas tank, then position the filler neck into the quarter panel from the inside the trunk. Then work the gas tank back up at the same time working the filler neck into it. Keep filler neck properly positioned into the quarter panel from the inside, while bringing the gas tank back up to position.

Someone just stabbed the filler neck in from outside the car with the gas tank still in the car.

Nope. Not on a 73+ car. The filler mounts to the OUTSIDE of the quarter panel on the 73+ cars. I'll upload the pictures that show exactly this in a minute.
 
Ok, here you go. First picture is an original '74 Duster filler tube and an original '71 Dart filler tube. The '74 tube uses only 3 screws, and you can see there's nothing threaded in the filler. The '71 is from a dart, you can see it uses 4 holes and you can see that they're threaded into the filler itself

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Next up is the quarter panel, first the '71 - the holes are oversize, and you can see nothing threads into them. The screws thread into the filler neck flange that goes behind the quarter
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The '74 Duster. The filler in on the outside of the quarter, and you can see the holes in the quarter are what took the threads. I use a flip top adaptor on my car so that's what the extra hardware is for, I drilled new holes so I could run longer bolts with nuts on the back to keep my flip top from walking away. I drilled them offset from the original holes in case I wanted to go back to the original cap and hardware.
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The rest of the pictures from the '74. I pulled my flip top adaptor so you can see how everything fits with the stock cap.
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And a couple more, the original '74 cap in the original filler neck and the back of the cap for reference.

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The combination of the filler neck being on the outside of the quarter along with the gasket being between on the outside of the quarter pushing it out even further could account for all of the discrepancy.
 
The combination of the filler neck being on the outside of the quarter along with the gasket being between on the outside of the quarter pushing it out even further could account for all of the discrepancy.

Nope. The gasket is supposed to be just like it is. He’s got the wrong cap. He might be able to tighten those screws a bit, but that does not account for the cap being a 1/2” out.

My car is missing the gasket, it’s supposed to be there.
 
Nope. The gasket is supposed to be just like it is. He’s got the wrong cap. He might be able to tighten those screws a bit, but that does not account for the cap being a 1/2” out.

My car is missing the gasket, it’s supposed to be there.

Yeah but on the inside of the quarter between the filler neck and the inside of the quarter.
 
Yeah but on the inside of the quarter between the filler neck and the inside of the quarter.

Ok, I went back and looked at post #15. You're right. I stand corrected.
 
Ok, I went back and looked at post #15. You're right. I stand corrected.

Yeah I don’t know for sure if it changed for ‘72 or ‘73. But I know for sure that from ‘73+ the fillers went through from the outside. Might have started in ‘72 going off of the older picture laying out the ID’s of the caps.

The caps are a pain, some of the changes were relatively minor and I think the parts cross-references are all over the map as far as what’s supposed to fit what. Add that to the fact that a really small difference in a tab can mean it doesn’t fit tightly and buying a cap off the internet to fit your car is a total crap shoot. They’re listed incorrectly all the time, and then they’re all made overseas now so even if you get the right one it doesn’t necessarily mean it’ll fit right anyway.
 
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