Fuel Filler Pipe Problem

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Apr 6, 2016 | 12:25 PM

#16

1986F150six

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Joined: Jul 2009

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From: Sheffield, AL

My suspicion is that when the plate holding the "flapper" was dislodged or removed, the 3/4" plastic vent tube was also dislodged, so the tank cannot vent while being filled.

http://www.bing.com/images/search?q=...ao0&ajaxhist=0

I hope the above link works... this is not the correct "flapper" piece, but it gives you an idea of what it looks like.

Last edited by 1986F150six; Apr 6, 2016 at 12:29 PM. Reason: Added link.

Apr 6, 2016 | 12:45 PM

#17

LARIAT 85

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Cargo Master

Joined: Dec 2004

Posts: 3,362

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From: Florence, SC

Quote:

Originally Posted by 1986F150six

My suspicion is that when the plate holding the "flapper" was dislodged or removed, the 3/4" plastic vent tube was also dislodged, so the tank cannot vent while being filled.

fuel filling problem ford truck 1985 - Bing images

I hope the above link works... this is not the correct "flapper" piece, but it gives you an idea of what it looks like.

Given the size of it, I don't see how the metal "flapper" plate could have been pushed down into the hose. Someone had to have removed it from the top. If something that large was lodged in the pipe, there is NO WAY gas would even be able to get down into the gas tank.

The plastic vent tube...what holds it in place, inside the metal filler pipe?

Apr 7, 2016 | 11:36 AM

#18

LARIAT 85

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From: Florence, SC

Quote:

Originally Posted by 4x484150

Lariat, maybe since the tab broke, it's blocking the inside black hose?

Also, do you have the original style filler neck, or the 87+ style?
Here is a reference picture for the inside of the necks.

What is holding the "vent" hose inside the fuel filler neck on the Pre-'87 version? Does the filler neck and vent hose come as an assembly?

Apr 7, 2016 | 01:29 PM

#19

1986F150six

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Joined: Jul 2009

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From: Sheffield, AL

I believe the vent hose connects to the piece which is missing from the neck of the inlet hose on your truck, LARIAT 85.

Apr 7, 2016 | 01:41 PM

#20

LARIAT 85

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From: Florence, SC

I think you are correct, 1986F150six:

https://www.ford-trucks.com/forums/4...-the-pump.html

https://www.ford-trucks.com/forums/6...se-needed.html

Apr 7, 2016 | 01:55 PM

#21

1986F150six

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Joined: Jul 2009

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From: Sheffield, AL

LARIAT 85, is your truck swb with the ~16 gal. single tank?

Apr 7, 2016 | 02:00 PM

#22

madpogue

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Joined: Oct 2003

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From: Madison, WI

Have you contacted the painters about this? Seems pretty clear they put something together wrong. Maybe they pulled that inner vent out of the pipe and failed to reinstall it. Or maybe they damaged your filler neck when removing the bed, and threw on some replacement that uses a different vent (like the '87-up one).

Of course, it's also possible that by neglecting to put that second clamp on, and secure the pipe to the tab/clip on the bedside, they created a bend in the filler hose that requires the fuel to go up before it goes down into the tank (between the tab/clip point and the frame), causing a venting issue. I've seen lots of filling/venting issue threads, esp. with the diesels, and one "remedy" is to drive the LR wheel up on a block. This creates a more downward flow of fuel into the tank.

Just guessing here, but maybe that bit of upward flow caused by the end of the neck sitting a bit lower (you can see the gap between the neck and the tab that's supposed to be holding it) is what's causing the issue. So you may want to start with replacing that clamp, and see if the new position of the neck/hose helps.

Still pretty negligent on the part of the shop that painted it.