Does anyone have gas cap aftermarket numbers for the vented and non-vented requirements? I found an ebay seller with lots of nos caps, so I need numbers for aftermarket companies like Robertshaw, Stant, etc.
Specifically I need to know if a Robertshaw RG-31 is the right non vented cap.
I'm glad to see your inquiry. I have bought 3 gas caps for mine and still do not have a good fit. I hope someone can help. Thanks for posting Rich.
the best i can come up with is a gates number 31631.the gates catalogue says the gas caps fits 53 to 63 ford full size sedans.they say it is 2 7/8 wide overall and 1 1/8 high overall and where it fits the filler neck it is 1 1/2 wide.they call it a deep cam; space between gasket and ears that engage filler neck are longer.the shallow cams are about 13/16 high overall.hope this helps
Interesting on the shallow cam statement. I wondered exactly that about my aftermarket gas tank. My locking gas cap, which leaks a little, pushes in until two tabs snap in place. there is no turning to engage the cam action. As hard as it is to push in, when it does engage both tabs, I can still rock the cap back and forth a little. A deeper lip on the filler neck would seem to solve that issue, assuming I had the strenth to engage it.
This is a link to the ebay seller on the nos aftermarket caps. I ordered one yesterday, so I'll know in a week or so if it at least fits. I did send him an email asking if it was a non vented or vented cap, but so far haven't got a response. From the pics. I'm 95% sure it's non vented.
http://www.ebay.com/itm/262376522157
That looks like the standard non-vented cap to me..
I too need a new gas cap, as two of the ones I bought had a loose fit, and I had to return them. I searched the Gates Automotive catalog on line and there is no 31631 listed. The highest gas cap part number is 31625.
Out of curiousity, Cluster, original tank or aftermarket?
I'll post how the one I ordered fits after I get it.
It's an aftermarket tank Rich. The neck is the same as the original, as my old locking cap off the original tank fits the same.
It does require a deep cap inside piece. The catalogs show the caps to fit a range of years in luring the 57 but do not. My tank is a new tank but takes the original cap. As mentioned earlier I have bought three that the various catalogs show to fit but no luck yet. Hopefully an actual cap and number may come out of this interaction.
Quote from: clusterbuster on 2016-08-12 18:05
I too need a new gas cap, as two of the ones I bought had a loose fit, and I had to return them. I searched the Gates Automotive catalog on line and there is no 31631 listed. The highest gas cap part number is 31625.
the number is from a 1975 catalog.it was not listed in my 1986 catalog,but was in the 1996 gates jobber data guide.you will have to check with gates,it may be discontinued
I ordered one from Ebay today as well Rich. Venting should be okay or he has a lot of mis-information for all the Ford vehicles that it is supposed to fit. Thanks for the tip.
Got it today. It's a really nice tight fit on my old gas tank. I do not believe it is vented, but to be 100% sure, when I have a minute, I'll throw some solvent in the tank and turn it upside down on the filler to see if it leaks. I've got my new tank filler all masked off for painting the car, so I won't check that fit for a while.
That's good to know Rich. I'll order one now. Thanks for posting the info.
Quote from: clusterbuster on 2016-08-14 16:17
I ordered one from Ebay today as well Rich. Venting should be okay or he has a lot of mis-information for all the Ford vehicles that it is supposed to fit. Thanks for the tip.
Problem is...it fits as advertised, but no specific models were noted, and we know the wagons need a vented, the passenger cars need non-vented...so yep, it fits but may not be what is needed for a specific model. With that said, the seller did say he had thousands of nos caps, so if something specific was needed, forward him the info. Tommorrow I'll try to get some liquid in my old tank in storage to see what I've got.
Rich, I just happend to come across a small lot of NORS caps recently and thought I'd share this for reference. Here I have a NON vented STANT G31, fits 53 to 63 Ford pssgr according to the box.
I also found another old Stant box in my pile that I used the non vented cap for my 1962 Mercury Comet and the box states also a fit for 53 to 63 Ford pssgr. #is G22
I tried the G31 on my Del Rio filler neck and will go in the bayonet, but will not tighten up and lock ( because the wagon needs a vented one).
it's incredible how nicely those cheap old NORS caps were made in USA, when compared to todays cheap aftermarket crap, which cuts your fingers as soon as you get it out of the box.
I'd love to find one of those old type Vented caps for my Ranchero, but they are like trying to find hens teeth..
DJ...thanks for posting that. I loved the note that says see other boxes for more applications, lol. What is the difference between the g22 and the pictured g31?
Am I correct that those designations are for the cap design, regardless of manufacturer? In other words all of the manufacturers used the same part number?
Rich, I think these are Stant numbers. obviously the G means gas, as I have oil filler caps too and they read SO *** (Oil).
Unfortunately I don't have the G22 cap anymore as it's on the Merc I sold. Maybe I can find pics. If you need dimensions or more pics of the non vented G31 cap I have ( fits 53-63 Ford pssgr) let me know.
the gates number ends in 31.maybe the end numbers are the same?
And the Robertshaw number the ebay seller actually had posted is RG-31.
Interesting. I never heard of standardized gas caps/numbers before. but in Europe we have them. Actually here they are refered by the inner filler neck diameter. some also fit the American sizes and they are cheap. made of neat aluminium, much like the old tractor tank caps or else.
I need to use a non vented cap on my Del Rio, since I am going to move the filler neck inside and add a vent hose.
Received the G31 gas cap today and it does not fit--way too loose. My tank is an aftermarket tank so I guess that is the problem. I am going to give up on a new cap, as I made two gaskets out of a truck inner tube, doubled the gasket, and that tightened the old cap up nicely. Even when I tripled the gasket on the new cap it was too loose. Beware if you have an aftermarket tank and look for a good gas cap fit.
Well, shoot...just when we thought we had the problems resolved...at least for the non vented. Where was your tank purchased? Now I'm going to have to unmask my tank on the car to see if I have the same problem. My tank was from auto city classic. I'll post the results.
EDIT.............I lucked out. The Stant G-31 cap I got fits the new tank as tightly as the old tank. Now I'm especially curious to hear where your tank was from. Also, Cluster, what brand G 31 cap did you get?
Also, was thinking if I had the same issue, I'd look into bonding a ring to the filler rather than modifying the cap....Maybe a nylon/mylar/plastic type material or aluminum. I'm thinking rubber is gonna wear out pretty quick.
Cluster...if you want/need, I can dig out my micrometers and calipers get get some dimensions so we can compare caps and filler necks. It would be nice to nail down the cause of some having issues getting caps to fit.
Rich, I bought the new cap from myestatesales1989 on Ebay. It is the Robert Shaw RG-31. No need to measure Rich, as I will just make do with the thick double rubber gasket on the old cap. I contacted the company that I bought the tank from to see if they can get a number for a cap for their tank. I deleted the company, and I can't remember the name I sent to today. Will try to dig it up later.
Found the company faster than I thought. Went back into my history and found it was Paceauto1 that I bought the tank from. It fit perfect and was made in Canada I believe. $181.21 free shipping.
This gas cap thread is very timely. About a week to 10 days ago, I contacted Stant via E-mail asking them what gas cap was correct for my Ranchero. They replied that their catalog did not go back that far. When these most recent postings with the G-31 etc. part numbers appeared I contacted them again and quoted the "Fitment" list as is shown on the two boxes. Yes, I understand that the numbers quoted are for non vented caps, but my thought was that if in fact these two Stant numbers were correct, perhaps Stant could look up the specs for the non-vented cap and it would lead them to the specs and part number for the vented cap that Wagons and Rancheros need. I offered to send them the filler pipe from my Ranchero ( on the condition I got it back! ) so they could find the correct cap. That was a day or so ago, and I've not received a reply as of this posting.
When I receive a reply, I'll let y'all know.
John
the gates number for the s/w, ranchero is 31640.this one is a shallow cam.the newest listing i have says it fits full size fords,merc and t-bird for 1970.also have a mcquay-norris number dgf 40.i was a partsman in the 90's and have ford and jobber parts books,the oldest going back to the 30's.here is a picture from the gates jobber data guide showing the spex on the 2 gas caps in question.hope this helps
Quote from: KYBlueOval on 2016-08-19 04:18
This gas cap thread is very timely. About a week to 10 days ago, I contacted Stant via E-mail asking them what gas cap was correct for my Ranchero. They replied that their catalog did not go back that far. When these most recent postings with the G-31 etc. part numbers appeared I contacted them again and quoted the "Fitment" list as is shown on the two boxes. Yes, I understand that the numbers quoted are for non vented caps, but my thought was that if in fact these two Stant numbers were correct, perhaps Stant could look up the specs for the non-vented cap and it would lead them to the specs and part number for the vented cap that Wagons and Rancheros need. I offered to send them the filler pipe from my Ranchero ( on the condition I got it back! ) so they could find the correct cap. That was a day or so ago, and I've not received a reply as of this posting.
When I receive a reply, I'll let y'all know.
John
I'm not sure I would trust sending my filler neck off to someone. not with my luck :005:
I found two different caps to fit my Ranchero that are vented. My problem is they only vent in one direction, letting air in but don't let pressure out. No NEW manufactured caps allow venting, Fed regulation since the early 70's. This is a common problem people with early Ford pickups, Corvettes and other also have. Many of these people including myself just drill a small 1/16 hole in the cap to let it vent. Not the best solution but I haven't found a better one yet.
With out the vent hole, in my area and temps in the 100+ the tank builds so much pressure that when you remove the cap the air/fumes and sometimes gas comes flying out and I had heard the tank oil can at times. It no longer does that with the hole.
Rich, would you mind checking the thickness of the lip inside the gas tank filler neck. Mine is 7/16''. I replaced my tank years ago and have tried a few differant caps but no luck. If yours is the same I will order one of the caps like yours. Thanks
You should be good at 7/16, Kerby. I measured mine at the widest part of the cam/sloped lip, just before the stop, and got .407 from the inside step, which is .042 deep on mine, so adding those together gets to .449. 7/16 is .4375, so pretty close to what you got. That cap should work fine for you. I also measured the cap, and at the bottom of the ears to the seal is .410, so the numbers work out good.
I'm glad you asked me to do this...I discovered what may have been causing the small leak with my nice chrome locking cap...look at the outer ring where the seal contacts the neck. Up top next to the notch, almost in the shadows, you'll see a little deformaty in the metal. It's like a little dimple sticking out.
Thank you Rich, I appreciate your measuring that. I know it will fit, no more trial caps. I'm glad you found the imperfection. I'll look at mine a bit closer. Best Regards my friend.
Quote from: canadian_ranchero on 2016-08-19 10:54
the gates number for the s/w, ranchero is 31640.this one is a shallow cam.the newest listing i have says it fits full size fords,merc and t-bird for 1970.also have a mcquay-norris number dgf 40.i was a partsman in the 90's and have ford and jobber parts books,the oldest going back to the 30's.here is a picture from the gates jobber data guide showing the spex on the 2 gas caps in question.hope this helps
Thanks for the Gates number 31640. I ordered one from a Amazon seller. Should be here soon. In the mean time, I went to the Gates website and put the 31640 number in and asked for the application. Although our '57 Fords are not listed, they do list this 31640 as being the correct cap for '58 Edsel Bermuda Wagons, '58 Edsel Roundup Wagons and '58,'59 &'60 Edsel Villager Wagons. It's worth noting that there were no '57 or '58 Mercury's listed either.
This all leads me to this question...........is the gas tank and filler pipe and gas cap on '57 Wagons and Rancheros the same as the tanks, filler pipes and gas caps on Edsels and Mercury Wagons? My guess is they are the same, but it is just a guess. Those of you with Edsels and Mercury's hopefully have the answer.
Thanks
John
the 31640 is listed for 54-58 and 61-63 merc s/w.the gates book i have does not list the edsel
Quote from: canadian_ranchero on 2016-08-25 20:11
the 31640 is listed for 54-58 and 61-63 merc s/w.the gates book i have does not list the edsel
Thanks. I guess it is safe to say that the Edsels, Mercurys and Ford Station Wagons are the same. I wonder why Gates does not recognize they are all the same. I sent Gates a message today asking if the Ford, Mercury and Edsel wagon gas caps were the same. Their answer was that they did not have a listing for '57 Ford Station Wagons and that their gas caps are made by Stant.
I received my 31640 Gates cap a little while ago. It looks identical to the original I have. It also confirms that the Gates gas cap is made by Stant, as it has the Stant "S" stamped in the center.
Got my gas cap Saturday and it fits, thanks Rich for starting the thread and sharing the information and part number.
Glad it worked out.
I went back and reread the entire thread, curious how it got to 3 pages on just a gas cap, and I've got to correct my very first post where I stated "I found an ebay seller......". What I should have said, and was surprised I didn't, was........... "there was a thread going on in the 52-59 Ford Hamb club about gas caps and one of the members there posted an ebay link....".
Totally his and their doing....I just brought it here.
Also...in rereading the thread, I picked up on something important DJ posted on his first reply. I had totally missed what he said the first time I read it...the fact that the G31 cap did NOT tighten on the Del Rio neck. He, I think, was wondering out loud if that was because the Del Rio needed a venting cap. Could it be he is correct, and to keep all caps the same to simplify and eliminate a posible dangerous situation by offering two caps, they opted to keep just one cap, but alter the neck on the wagons, Rancheros,etc. so that cap wouldn't tighten ?
OR...more likely, I think, was the idea to make the necks different so only the correct cap would fit properly.
It's posts like this that really make this site what it is! I didn't know where to start trying to find a gas-cap, I was resigning myself to having to use one of those awful emergency plastic push in caps, but after reading through all of this I'm now FAR wiser (just maybe not smarter!!!).
.......plenty for sale on EBay but how on earth do some justify $92 to post one to England????? Found someone who'll post for a more reasonable $20!
That's a huge difference!
Just to make sure we've got our facts straight......
DJ: on your Del Rio wagon, is it the oem tank or an aftermarket?
Clusterbuster: What model '57 do you have that the tank's neck is too 'thin', like DJ's wagon? I was assuming it was a Custom or Fairlane, but realized I couldn't remember for sure.
Rich, it was exactly what I was thinking in my mind. I didn't even buy the G31 for using it on the 57wagon, it just came in a lot of NOS caps. and I will make use of it later on other cars. My tank and filler neck are original to the 57 Del Rio wagon and the G31 cap is loose. I was exactly thinking the same as you, if they used a different neck to make sure that you had a vented cap on the (non vented) wagon and Ranchero tank (filler necks). I would be interested in what Gary ( Limey) bought for a cap for his Ranchero and if it fits ?!
Thanks, and now we have to wonder if some of the aftermarket manufactures are unaware there is suppose to be two different filler necks and use the same tooling for both.
if you look at the spex page i posted you will see the 31640 is a shallow cam and the 31631 has a deeper/longer cam.that would make the 31631 loose on a s/w filler neck