difference between 84-92 and 93-96 gas caps?
Thread Starter
Team Owner
Joined: Dec 2007
Posts: 20,974
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difference between 84-92 and 93-96 gas caps?
Is the only difference the handle part on the 93+?
I am under the impression most 80s-90s gm gas caps are mostly interchangeable.
I want to know if the later ones will fit under my '90 fuel door?
I want a vented cap that fits under my fuel door, and it looks like the older truck ones will work but they have the handle on it mine is flat. If a 93+ fits in my fuel door the truck one should too?
I am under the impression most 80s-90s gm gas caps are mostly interchangeable.
I want to know if the later ones will fit under my '90 fuel door?
I want a vented cap that fits under my fuel door, and it looks like the older truck ones will work but they have the handle on it mine is flat. If a 93+ fits in my fuel door the truck one should too?
Last edited by pologreen1; Mar 12, 2017 at 07:53 PM.
Racer
Joined: Jul 2016
Posts: 320
Likes: 23
Is the only difference the handle part on the 93+?
I am under the impression most 80s-90s gm gas caps are mostly interchangeable.
I want to know if the later ones will fit under my '90 fuel door?
I want a vented cap that fits under my fuel door, and it looks like the older truck ones will work but they have the handle on it mine is flat. If a 93+ fits in my fuel door the truck one should too?
I am under the impression most 80s-90s gm gas caps are mostly interchangeable.
I want to know if the later ones will fit under my '90 fuel door?
I want a vented cap that fits under my fuel door, and it looks like the older truck ones will work but they have the handle on it mine is flat. If a 93+ fits in my fuel door the truck one should too?
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
When I got my '93 last year, the cap that the previous owner had installed was a locking cap with the raised handle like in the GM pic. Plenty of clearance for the filler door to close and fit flush with the body. I'm not a fan of locking caps so I replaced it with a Stant cap that had the handle. No problems with that cap either.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Why do you want a vented cap? I would think that such a cap may cause the evaporation emission pressure control valve and the evap emission canister to not work properly.
Safety Car
Joined: Aug 2013
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From: Minneapolis Mn
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Instructor
Joined: Jan 2015
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From: Cave Creek arizona
The tank is building up quite a bit of pressure in the hot months. Lines are not plugged. Vacuum valves for the canister etc seem to be working. Charcoal canister seems to be unavailable for purchase. Since a vented cap is not out there, will have to continue to troubleshoot. Gotta be something simple.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The tank is building up quite a bit of pressure in the hot months. Lines are not plugged. Vacuum valves for the canister etc seem to be working. Charcoal canister seems to be unavailable for purchase. Since a vented cap is not out there, will have to continue to troubleshoot. Gotta be something simple.
Racer
Joined: Jul 2016
Posts: 320
Likes: 23
This is illegal but you can modify a normal cap to be vented. Most caps have a spring that releases pressure if it builds to much pressure. You can either put a softer spring in or no spring at all.
Again vented caps were illegal starting in the early to mid 70s so I highly doubt you will find one.
When you see a advertisement for a vented cap it just means it will vent under very high pressure but 99.9% of the time it acts as a sealed cap.
