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Autolite Flip Top Gas Cap Install
#1
I have an Autolite gas cap I’m assuming off a 71 that I want to use on my 73 Mach but the original filler neck doesn’t line up with the holes on the cap.
Anyone know how to solve this? Do I buy a 71 filler neck?
Thanks Johnny
Here’s a pic of cap and my fuel neck

[Image: image.jpg]


[Image: image.jpg]
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#2
It should if the button on top
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#3
I think in is correct with the bolt in center at top. Cap drops down.
David


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#4
Installed like this.

[Image: 67e6b04b096ef04f1b945f65d1aad362.jpg]


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#5
Johnny, the same filler neck was used from 71-73 regardless of the fuel cap used. As red351 and David have stated the cap latches at the top and hinges from the bottom.
Turn cap 180 degrees from the way you have posted in picture and it should work.
Just a word of caution. There was a safety issue with those caps leaking fuel in accidents and the Government got involved. That's why Ford did not production install those on 72-73 Mustangs. The seal also appears to have two cracks which will prevent a good seal at the filler neck. Not trying to bust your bubble on your find, I have the same cap on two 71 Mach 1's.

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
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#6
(04-26-2018, 08:28 PM)secluff Wrote: There was a safety issue with those caps leaking fuel in accidents and the Government got involved.
Pinto carryover.... lol

(04-26-2018, 08:28 PM)secluff Wrote: The seal also appears to have two cracks which will prevent a good seal at the filler neck.
Improves venting....


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        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
4-wheel disc brakes
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#7
I had to drill the hole where the post is i guess it was a bit smaller, as for the safety issue I saw a lot of articles on that, I also think I had issue because of the screws I had were the ones in picture and not flush like there supposed to be. I couldn’t find the correct screw at Lowe’s , but I may be able to order some. I figured a bit of rtv on the cracks may help along with the rubber renew liquid I have that helps soften things. I also may cut a new rubber gasket and try to replace the original.
Thanks guys
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#8
RTV will soften up in that application. Cut a ring of rubber to replace the existing one and use Seal All contact adhesive. As to the safety issue, drive faster than everyone else and never stop and you will be fine Big Grin

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#9
(04-26-2018, 09:43 PM)JohnnyTownsend Wrote: I had to drill the hole where the post is i guess it was a bit smaller, as for the safety issue I saw a lot of articles on that, I also think I had issue because of the screws I had were the ones in picture and not flush like there supposed to be. I couldn’t find the correct screw at Lowe’s , but I may be able to order some. I figured a bit of rtv on the cracks may help along with the rubber renew liquid I have that helps soften things. I also may cut a new rubber gasket and try to replace the original.
Thanks guys

 I found a nice 71 flip-open gas cap a few years ago, paid 10 bucks for it!, but the rubber was shot. Needing some rubber about 1/16" thick, I managed to get samples of pond liner which I then soaked in gasoline for a few days. I found the gas eat one, but one was okay, so I made the new seal from that. What I'm saying here is you'll need to find material that is gas proof, so don't just use whatever you find. If I'm not mistaken, the twist on caps are vented whereas the flip open is not, so make sure your return vent line is clear (blow through it!)
Geoff.

EDIT: 7pm. I just took a closer look at he center piece of the flip open cap I have and I may have been mistaken. It indeed looks like there is a vent of some sort, it's just not that obvious by taking a quick look. I stand corrected. However, I would still make sure that either the return vent or the cap vent work.
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#10
I believe the flip open caps have a vent that allows air in but not out (i cant remember for sure). They have a hole in the center of the cap with some mechanism in there, at least mine. In my case i eliminated the charcoal canister so with a screw driver i broke whatever was inside the cap and it allows air in and out through said hole. I have been running it this way with no problems.

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        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
4-wheel disc brakes
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