There should be a large diameter vent tube next to the fill tube of the gas tank filler neck. Check to see if it is pinched. Also i think there were some changes to this between the years.

 

Yo Inverhyt,
As ThrustMaster advised,

Fill & Vent Tube pics in; "...pre 87 Broncos & F Series use a small corrugated plastic vent tube tucked into the top of the steel filler neck , but it often kinks & blocks fuel from entering the tank easily. 87 & up use a heavy plastic filler hose inside the steel vent neck, which allows easier filling.The necks are interchangeable, so it's a good upgrade for an old truck, especially if filling is becoming a problem. It also allows the use of a more modern gas cap..."

Source: by justshootme84 (Randy Z, Casual Mudder).. Rest-in-peace my friend.

Filler Neck Supply - Bronco/Ford truck Bronco gas tank fuel filler neck & tubes; Bronco in 87-91; 92-96
http://www.fillernecksupply.com
They suggest; "...look up under the box to visually compare this with your filler neck..."

 

I replaced my tank but had the same problem with my 84

The only way I could get gas in was to park the driver's rear tire on a 4x4 like a ramp. Then she filled fine.

The body mounts were so shot the filler neck opening eventually lowered and the neck was essentially going up hill into the tank.

I noticed the new neck I bought was a tad long and it sort of kinked. So I trimmed it to fit better

And I replaced the body mounts and adjusted the filler neck to make sure it was pointing down hill (opening higher than the tank opening) and it works like a wet dream.



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Whelp I don't have that vent tube at all. I don't ever remember seeing it.

Guess I'm getting a new filler neck

 

It is a tube inside a tube design. The outer tube is fill vent and the inner tube is the fill. It is easy to not notice. Due to age I am willing to bet the inner tube is collapsed or kinked.

Fillerneck Supply has both hoses. The actual metal part is no longer carried by them, but last time I looked was available on Amazon.

 

It is a tube inside a tube design. The outer tube is fill vent and the inner tube is the fill. It is easy to not notice. Due to age I am willing to bet the inner tube is collapsed or kinked.



Fillerneck Supply has both hoses. The actual metal part is no longer carried by them, but last time I looked was available on Amazon.

I mean. I don't have one.

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If you don't have one, then you're probably pouring gas down both the vent tube AND the gas tube, which makes venting a mess.

I had this issue really badly on my '81 and would often times spend 20 minutes filling it up from empty. It was downright tedious.

I replaced the whole thing with a filler neck and tube from an '87+ (like the ones Miesk posted) and it completely resolved the issue.
You can grab one from a junk yard, or buy the whole setup new (although they're kind of expensive).

 

If you don't have one, then you're probably pouring gas down both the vent tube AND the gas tube, which makes venting a mess.



I had this issue really badly on my '81 and would often times spend 20 minutes filling it up from empty. It was downright tedious.



I replaced the whole thing with a filler neck and tube from an '87+ (like the ones Miesk posted) and it completely resolved the issue.

You can grab one from a junk yard, or buy the whole setup new (although they're kind of expensive).

Is it just Broncos that have that filler or can one off a F150-350 work

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From everything I have seen it has to be from a Bronco. You can get the internal and external hoses from Filler Neck Supply. It seems all aftermarket supplies of the complete filler neck have dried up.

 

Yeah, it's Bronco specific, since the tanks are a different shape and in a different location than the trucks, so the filler neck is perfectly form fitted to reach.

 

I have a filler neck I picked off an 89. I remember it has a couple dents, but it has the vent hose and I believe the outer hose too. If you think you might be interested, shoot me a PM.

 

There's a Old Ford parts dealer over here in the NW that has a stash of parts. Managed to get one from him in the same day from an 87. I fitted it up and it all works fantastic! Thank you for all the help!

If anyone near the Portland area wants the aforementioned dealer I will absolutely give you his number.

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