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I have one of them Stant Locking gas caps on my truck. I'm on about the 5th one. The rubber seal lasts for about a year then cracks and then I smell gas anytime I round a corner after filling up.
Does anyone make a locking gas cap with a longer lasting seal? Silicone maybe.
I don't have a 72, but on my 66 the cap is vented and you never fill it all the way up or what you describe will happen. I use the Bob Drake cap and it's never had a problem. https://www.ebay.com/itm/Ford-Lockin...YAAMXQq8BQ7Cug
I just got new ones after my painter instead of calling me for the key drilled out the auxiliary tank gas cap lock. I called STANT when O'Reilly couldnt figure out how to get me the Keyed Alike caps I wanted. I asked about the seal because my old Stant one that came to me when I bought the truck 2 years ago was cracked...Rob Ball is the Stant tech who helped me several months ago 765-827-8292. I asked him if they sold only the seal and he said No but they do send out some as warranty "from time to time" you may want to contact him
I have one of them Stant Locking gas caps on my truck. I'm on about the 5th one. The rubber seal lasts for about a year then cracks and then I smell gas anytime I round a corner after filling up.
Does anyone make a locking gas cap with a longer lasting seal? Silicone maybe.
Well, been using the Stant locking gas cap every since 1978 and back then the seal lasted a long time. But every since we have lead free gas the seals have cracked
like you have said. I just installed a vented cap where as the others I can't remember but have smelled gas and sure it was coming through the after market float gauge unit.
The vented cap fixed the problem with vapor leakage at the in cab tank..
Orich .
A place that you may want to try is your local John Deere dealer. It may sound stupid but the gas cap on a 1967 Ford F-100 is the exact same as a 1990's John Deere 1070 diesel tractor. My Dad has a 1070 and I got to looking at the cap and thought that looks an awful like the cap on my 67. So I tried it and it fits like Ford made it. I don't know if J.D. sells locking caps but it's another place to look..It's even the same color as my truck.
A place that you may want to try is your local John Deere dealer. It may sound stupid but the gas cap on a 1967 Ford F-100 is the exact same as a 1990's John Deere 1070 diesel tractor. My Dad has a 1070 and I got to looking at the cap and thought that looks an awful like the cap on my 67. So I tried it and it fits like Ford made it. I don't know if J.D. sells locking caps but it's another place to look..It's even the same color as my truck.
Back in the day f100 had a non vented cap as the had that a vapor recovery system. And from what I heard the gas filler neck was a different size. "hear say"
The f250 used a vented cap up into the mid 70's then some everything had to have smog crap f100,f350 from what I understand..
Orich
A place that you may want to try is your local John Deere dealer. It may sound stupid but the gas cap on a 1967 Ford F-100 is the exact same as a 1990's John Deere 1070 diesel tractor. My Dad has a 1070 and I got to looking at the cap and thought that looks an awful like the cap on my 67. So I tried it and it fits like Ford made it. I don't know if J.D. sells locking caps but it's another place to look..It's even the same color as my truck.
Does the seal on this one last? That's the only problem with the Stants. Every year or two I throw away a perfectly good locking gas cap because the seal cracks. What good is a seal that don't seal?
Not a silicone seal in gas caps. Silicone can't deal with oil, much less gas. Rubbers may not like the alcohol in modern gas either.
I'd be interested in a cap that takes a replacement seal. Mine last three years or so, and start checking/cracking.
Yes, I overfill. Long-distance driving!
...eh, yeah, I know....
Thanks for the update. Glad you’ve got it fixed for now,
but let us know if it deteriorates anytime soon.
I don’t see anywhere in the description that it says it’s compatible with petroleum products, or that it adheres to rubber. Very curious how long it lasts.
Be great if it does last forever like some sealer‘s.
On the diesel swap I learned a bit about venting the stock tank, an engine lift pump can get rapidly fatigued and worn if it’s pulling on an unvented tank and with the return line involved, and am guessing a gas fuel pump would probably have the same issue. I believe the consensus is that you can’t over vent a fuel tank. But how you do it safely might be the limiting factor. I had to modify the stock tank and put a separate vent line up the cab pillar, under the roof then down the windshield pillar to the engine compartment and got a tank vent check valve mounted above the tank in the event of rollover. FWIW hard part is installing the vent bung, probably more work than what it is worth for a gas situation. .02$
Fuel tank vent check valve next to master cylinder
Not silicone...
