Bluffman

I have not had this car very long, just ordered a manual for repair, is it possible to remove the rubber boot between body and filler neck to replace the cork seal of the filler neck to tank. Thanks Ian

Powershift

Yes. Remove the gas cap and perhaps a couple of the screws on the gas cap cover or the surrounding stainless bezel that may protrude inward and create a problem. Then simply pull the boot up. Maybe use a bit of Vaseline to make things slide easier over the metal filler neck. Take your time, it will come out.

Just be careful with the drain nipple on the boot............although it is not hard to redo if necessary. Maybe it is just easier to disconnect the drain hose from the boot to improve your work access.

Since your car is a 1967, you can also check for the tank sticker while you are there.

Larry

Bluffman

Thank you really appreciate your fast reply, if only I could get that gasket as fast, lol

Powershift

Just remember that you will be working over liquid gasoline. Don't smoke during the job or create sparks . Also try not to drop anything into the gas tank...........although on a 1967 convertible someone with small hands and arms (wife/girlfriend) can just about retrieve anything you drop in there.

Larry

Bluffman

I have enough issues with the gas smell, if I ask her to retrieve something out of the tank, I will never here the end. Lol

Frankie the Fink

You may want to order two seals - those tank filler neck flanges are a bit wavy and might need the extra thickness...make sure you get the right filler neck attaching screws too. The correct ones have an integral rubber piece for proper sealing. Make sure your gas cap is in good shape; that can contribute to the raw gas odor.

vark_wso

The filler neck screws are p/n 3767804; you'll need 9 each. I was able to buy them from local Chevy dealer recently, but they had to order from warehouse which took a few days.

While you're in there, determine if you have a GM replacement gas tank. GM SERVICE fuel tanks for all 63-69 Corvettes after about 1970 included an integral pressure-vacuum valve. When this tank is used, GM instructs that a sealed (non-vented) fuel cap should be used. This is exactly the same as the PRODUCTION configuration for all 1970-74 Corvettes & will reduce fuel vapor smell.

Once your filler neck is off, look about 4" toward the driver's side using a dental mirror (held tightly). Service replacement tanks will have a valve there, ~1" dia projecting near the top of the tank. Original tanks will not. If your tank has this valve, then recommend you use the non-vented '70-'74 version cap for best fuel smell control.

As Frankie says, recommend using two cork gaskets & don't over-torque the machine screws upon reassembly as the thin flange puckers easily. Keep debris out of the tank while cleaning the mating surfaces. I've used a funnel to cover the hole, but you'll still have to be careful not to scrape stuff in through the 9 female threaded holes while cleaning tank surface.

Bluffman

Thanks for all your advice, really appreciate it. Ian

Bluffman

Do you put anything on the cork before install, or do you just install it dry. Ian

Powershift

I simply used some Vaseline to hold it in place and steady when I reinstalled it. I did not use any special glue or sealant.

Other folks may be different.

Larry

Bluffman

Thanks Larry

tuxnharley

I used a thin coat of clear silicone sealant, spread it on carefully before installation. It helped hold it in place and I figured it would protect the cork and make it last for another 40/50 years or so!

Bluffman

Thanks for that tip also

Gary's '66

Maybe I missed it but just thought I'd mention this. Once you've removed the filler neck be sure to check the screw holes to see if any were sucked down due to over tightening. If so flatten them out before re-installation.

While everyone has their own way of doing things that's easiest for them I found that if I started the screws into the gasket with just a few turns, to keep them in place, I could then carefully put the neck in place then tighten each of them down a little at a time instead of trying to insert one screw at a time. Just another way to do it.

Another thing I did before I replaced the gasket was to fill the tank so that any old material would be easier to retrieve (since it will float) and got a small fish tank net in case some fell in.... which it did.

Gary

babbah

The filler gasket I used is rubber.

Frankie the Fink

I pre-started the screws too - and a thin layer of Permatex kept things in place..

Stingxray

Nooooo Not the cork gasket material ....... The woooorst . Pinch it down and it splits at the holes. w/ more leaks .... Ask me how I know

Frankie the Fink

The cork has been working fine for a year now, and, it worked for the 50+ years before that. No, you can't crank down on the screws like there's no tomorrow - not only can it mess up the gasket you can easily split the integral rubber on the mounting screws....

Guess what ? I only use cork valve cover gaskets too!

tbarb

Frank,

Do the screws have o-rings, the reason I ask is because my 67 needs a new cork gasket and I want to reuse the screws if it's just a matter of replacing the o-ring.

tuxnharley

Using silicone sealer takes care of that problem too! It's great - unless you are concerned about a potential NCRS level judging inspection in this area...............