Venting issues
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4wd Low
Joined: Jul 2024
Posts: 13
Likes: 1
Venting issues
I have ordered a vented gas cap for my 1967 Ford f100 in cab tank two times and continue to get the non-vented cap. The sales people at LMC truck are unhelpful in that they cannot determine what part number I need. Can anybody help me with this with a correct part number?
Cargo Master
Joined: Feb 2006
Posts: 3,010
Likes: 250
From: North Pole, Alaska
Don't use LMC. Just visit your local auto parts store like NAPA:
https://www.napaonline.com/en/p/THM7031220
https://www.napaonline.com/en/p/THM7031220
Logistics Pro
Joined: May 2015
Posts: 4,473
Likes: 971
From: Tri Cities, TN
I have ordered a vented gas cap for my 1967 Ford f100 in cab tank two times and continue to get the non-vented cap. The sales people at LMC truck are unhelpful in that they cannot determine what part number I need. Can anybody help me with this with a correct part number?
Logistics Pro
Joined: May 2015
Posts: 4,473
Likes: 971
From: Tri Cities, TN
Sorry but it won't work unless the truck has a vapor recovery system. The tanks without a vapor recovery system will build pressure when parked especially on a hot day.
5th Wheeling
Joined: Jun 2025
Posts: 43
Likes: 13
I got a vented cap from Carolina Classics that was actually vented. No more coming home to fuel pouring out of the cab because it pushes past the fittings under pressure!
https://carolina-classics.com/collec...1-b7c-9080-kit
https://carolina-classics.com/collec...1-b7c-9080-kit
Hotshot
Joined: Oct 2009
Posts: 16,188
Likes: 4,792
From: Burbank, WA
I got a vented cap from Carolina Classics that was actually vented. No more coming home to fuel pouring out of the cab because it pushes past the fittings under pressure!
https://carolina-classics.com/collec...1-b7c-9080-kit
https://carolina-classics.com/collec...1-b7c-9080-kit
Last edited by 52 Merc; Feb 9, 2026 at 10:45 PM.
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5th Wheeling
Joined: Jun 2025
Posts: 43
Likes: 13
The alternative is to just crack the cap open a little bit when parking so it can depressurize, my step-father does that with his custom engraved cap for his 1931 Model A that isn't vented 2 ways.
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Hotshot
Joined: Jul 2020
Posts: 10,519
Likes: 2,654
From: Near Salt Lake City
I think I would drill a small hole in the cap
The original vented cap had no check valve, same as the old GM stuff like my Camaro
Take off quick in a Camaro and you leave a small trail of fuel
That's the fuse
The original vented cap had no check valve, same as the old GM stuff like my Camaro
Take off quick in a Camaro and you leave a small trail of fuel
That's the fuse
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