1964 Locking Gas Cap

[Patrick C.]

Re: 1964 Locking Gas Cap

[QUOTE=Joe Lucia (12484);844739]

Patrick------

Fairly easy. Move the fuel neck seal (boot), looking about 4-5 inches to the left of the filler neck and within the tank-wide recessed area. If you see a round, approximately 1-1/2-2" OD more-or-less flat appearing device on the tank, then you have the integral pressure-vacuum valve. GM instructs that when a SERVICE tank with integral pressure vacuum valve is used, the sealed-type (non-vented) cap should also be used.

Another way to pretty reliably INFER whether the tank has the valve. Look at the tank from under the car. If the tank has the large "roundish" depressions on either end of the tank, the tank probably does not have the pressure-vacuum valve. If the tank has "rectangularish" depressions, the tank probably has the integral pressure-vacuum valve.

Does not look like I have the right tank on my '66 to use the non vented cap.

[Joe L.]

Re: 1964 Locking Gas Cap

[QUOTE=Patrick Cavanagh (57907);844826]

Does not look like I have the right tank on my '66 to use the non vented cap.

Pat------


Yes, this tank requires a vented type cap.

[E S.]

Re: 1964 Locking Gas Cap

Hi-Here is a 62 variety- Been on my 62 for at least 56 yrs, (probably since new-I could find out).It has a thick rubber or neoprene gasket, and seems to seal really well- Takes considerable pressure to "click" it on-haven't had any problems. Has an "S" shaped figure on the keyhole dust cover -I always wondered if that was related to the "S" that is stamped on some oil filler caps?
The cap on my 66 is vented,and has a cork gasket that still looks serviceable. It has a B&S key with a A9XX key code. ( The 62 cap has a plain aluminum key with a T6XX key code.) The 66 cap has been on this car since 1998 for sure,and I suspect for much longer. I have the original owner's info.; but have not talked to him personally.
As far as the leaks-I have not experienced any, but I really do not drive either car on two wheels too often(Ha)IMG_20200904_144115239.jpg





IMG_20200904_144349677.jpgIMG_20200904_145145978.jpgIMG_20200904_145158550.jpg

[Joe L.]

Re: 1964 Locking Gas Cap

Hi-Here is a 62 variety- Been on my 62 for at least 56 yrs, (probably since new-I could find out).It has a thick rubber or neoprene gasket, and seems to seal really well- Takes considerable pressure to "click" it on-haven't had any problems. Has an "S" shaped figure on the keyhole dust cover -I always wondered if that was related to the "S" that is stamped on some oil filler caps?
The cap on my 66 is vented,and has a cork gasket that still looks serviceable. It has a B&S key with a A9XX key code. ( The 62 cap has a plain aluminum key with a T6XX key code.) The 66 cap has been on this car since 1998 for sure,and I suspect for much longer. I have the original owner's info.; but have not talked to him personally.
As far as the leaks-I have not experienced any, but I really do not drive either car on two wheels too often(Ha)[ATTACH=CONFIG]100956[/ATTACH]





[ATTACH=CONFIG]100957[/ATTACH][ATTACH=CONFIG]100958[/ATTACH][ATTACH=CONFIG]100959[/ATTACH]

EJ------

The stylized "S" on the locking cap could represent Stant, a major manufacturer of gas caps and supplier to GM for many years. It could also represent Saginaw, a once-upon-a-time division of GM. Saginaw mostly manufactured steering components and other geared products. However, I think they did also manufacture gas caps for a period of time. To me, the stylized "S" looks more like the Saginaw version but it could be either.

In any event, a locking cap was once available from GM as an accessory item for C1 Corvettes.