'67 gas tank

[Neal K.]

I just received a new tank from Quanta products and it does not fit correctly. The Quanta tank varies from my original tank in the following areas:
1. Mine has a blow out plug on the top.
2. the filler neck opening on mine is a quarter inch farther back.
3. the fuel sender opening is a quarter inch further forward.
4. the front seam on mine is bent down Quanta tank is not.
5. The Anderson logo on mine is in the center of the bottom of the tank. On the Quanta tank its offset behind the fuel sender opening.
The tank from my car may not have been the original so I compared to a purported original tank(had the build sheet attached to it) from another '67. Both my tank and the other'67 tank were the same. The Quanta tank does not fit properly because the fuel neck is too far forward and the tank doesn't want to move back because the fuel sender attachment ring hits the supporting cross brace.
I spoke with Dave at Quanta who was most helpful. Other than the front seam not being bent down, he believes the Quanta tank is correct and that the blow out plug is actually a vent. He believes our tanks are from a 68. The owner of the other '67 tested his tank by pressurizing it to test for leaks and the tank swelled slightly. If the tank was vented it seems that air would have escaped thru the "vent". The owner of the other '67 who is also a mechanis says it's not a vent but is definately a plug.
Help!
Can anyone tell me what a '67 gas tank should look like?
Thanks
Neal

[Gary B.]

Re: '67 gas tank

Neal,

Sorry I can't answer your question, but I wanted to ask if the OL Anderson logo on the Quanta tank is oriented the same way as on your original? At one point in time, the Anderson logo on the Quanta tanks were rotated 90 degrees from original.

Gary

[Larry M.]

Re: '67 gas tank

Neal:

I do not think that the older gas tank is "original". I recently replaced my known original tank on my 1967 convertible with a Quanta tank, and both tanks were IDENTICAL.

A 1967 gas tank should not have a vent or blow-out plug. The tank is vented through the gas cap.

The OL Anderson logo on original 1967 gas tanks is offset to one side.

There are numerous pictures of mid-year gas tanks in the archives.

Larry

[Stephen L.]

Re: '67 gas tank

Neal, I've posted photos of my 67 original tank in the archives. Check my past posts. I'd place them in this post but this program won't allow that.
Steve

[Donald O.]

Re: '67 gas tank

Neal, I've posted photos of my 67 original tank in the archives. Check my past posts. I'd place them in this post but this program won't allow that.
Steve

copy the address of that post and include that in your next posting

[Neal K.]

Re: '67 gas tank

Thanks for all the input. I looked at the pictures of Stephen's gas tank in his prior post and am now fairly certain that the old tanks are not correct and that the Quanta reproduction tank is nearly correct with the exception of the seam not being bent down and the 1/4 inch descrepancy in the locations of the fuel neck and fuel sender openings. These descrepancies have been discussed in prior posts.
Neal

[Joe L.]

Re: '67 gas tank

I just received a new tank from Quanta products and it does not fit correctly. The Quanta tank varies from my original tank in the following areas:
1. Mine has a blow out plug on the top.
2. the filler neck opening on mine is a quarter inch farther back.
3. the fuel sender opening is a quarter inch further forward.
4. the front seam on mine is bent down Quanta tank is not.
5. The Anderson logo on mine is in the center of the bottom of the tank. On the Quanta tank its offset behind the fuel sender opening.
The tank from my car may not have been the original so I compared to a purported original tank(had the build sheet attached to it) from another '67. Both my tank and the other'67 tank were the same. The Quanta tank does not fit properly because the fuel neck is too far forward and the tank doesn't want to move back because the fuel sender attachment ring hits the supporting cross brace.
I spoke with Dave at Quanta who was most helpful. Other than the front seam not being bent down, he believes the Quanta tank is correct and that the blow out plug is actually a vent. He believes our tanks are from a 68. The owner of the other '67 tested his tank by pressurizing it to test for leaks and the tank swelled slightly. If the tank was vented it seems that air would have escaped thru the "vent". The owner of the other '67 who is also a mechanis says it's not a vent but is definately a plug.
Help!
Can anyone tell me what a '67 gas tank should look like?
Thanks
Neal

Neal------


No original 1967 Corvette fuel tank ever had a "blowout" plug ANYWHERE on the tank. Assuming that what you're describing is actually a pressure-vacuum valve located on the top of the tank and to the left of the filler opening, NO ORIGINAL 1967 Corvette fuel tank ever had one of those, either. Either way, it's NOT an original 1967 Corvette fuel tank.

The pressure-vacuum valve was present on GM SERVICE fuel tanks for 1967 Corvettes since 40 years ago, though.

[David L.]

Re: '67 gas tank

Joe,

Have you ever seen a date code on a Corvette gas tank?
When I did my frame-up restoration of my 1966 Corvette from 1980-1995 I never bothered to ever look for a date code.

My 1970 Camaro gas tank is stamped "5 70" (5th week of 1970) on one of the corners of the tank. I had to use a small wire brush to find it.

Dave

[Joe L.]

Re: '67 gas tank

Joe,

Have you ever seen a date code on a Corvette gas tank?
When I did my frame-up restoration of my 1966 Corvette from 1980-1995 I never bothered to ever look for a date code.

My 1970 Camaro gas tank is stamped "5 70" (5th week of 1970) on one of the corners of the tank. I had to use a small wire brush to find it.

Dave

Dave-----


The only possible date code I found on my original 1969 fuel tank was a "3-70" stamped on the flange for the fuel pick-up/gauge assembly. However, that could not possibly have been a reference to a date since my car was built in September, 1969. Unless someone sneaked into my garage one night and changed the fuel tank without telling me, I absolutely know that the tank stamped as described was the original tank installed in my car.

[David L.]

Re: '67 gas tank

Dave-----


The only possible date code I found on my original 1969 fuel tank was a "3-70" stamped on the flange for the fuel pick-up/gauge assembly. However, that could not possibly have been a reference to a date since my car was built in September, 1969. Unless someone sneaked into my garage one night and changed the fuel tank without telling me, I absolutely know that the tank stamped as described was the original tank installed in my car.

Joe,

On my 1970 Camaro tank the number "7" is much larger than the other two numbers ("5 70", last week of Jan. 1970). I got the tank from a 1970 Z28 with a "1/70" date on the driver's door sticker. I found out about the gas tank date code on a Nasty Z28 thread entitled "Fuel Tank Date Code 1970". You also made a post on this thread.

Dave

[Neal K.]

Re: '67 gas tank

Neal------


No original 1967 Corvette fuel tank ever had a "blowout" plug ANYWHERE on the tank. Assuming that what you're describing is actually a pressure-vacuum valve located on the top of the tank and to the left of the filler opening, NO ORIGINAL 1967 Corvette fuel tank ever had one of those, either. Either way, it's NOT an original 1967 Corvette fuel tank.

The pressure-vacuum valve was present on GM SERVICE fuel tanks for 1967 Corvettes since 40 years ago, though.

Joe,
One last question. Was the front seam bent down or only crimped in 2 places to accomodate the straps?
Neal

[Joe L.]

Re: '67 gas tank

Joe,
One last question. Was the front seam bent down or only crimped in 2 places to accomodate the straps?
Neal

Neal------


That I do not recall.

[John H.]

Re: '67 gas tank

Was the front seam bent down or only crimped in 2 places to accomodate the straps?
Neal

Neal -

Midyear tanks had the seam flange bent down locally (at the locations where the straps passed by) so the straps could be assembled; most of the reproduction tanks don't have the flange bent - you have to do it yourself.

[Neal K.]

Re: '67 gas tank

Neal -

Midyear tanks had the seam flange bent down locally (at the locations where the straps passed by) so the straps could be assembled; most of the reproduction tanks don't have the flange bent - you have to do it yourself.

John,
Can you be a little more specific with your reply?
Gary at Quanta insists that the front seam flange(the seam flange on the gas tank that faces the front of the car) was only crimped in 2 places to accomodate the straps. I am looking at 2 old tanks both from 67's(mine is probably a replacement, the other tank has St. Louis, the part number and U.S. Steel stenciled on it and the owner says it's original. Both my tank and his look the same and have blow out valves?) on which the front seam flange of tank is bent down the entire length of the seam flange and the back seam flange has 2 crimps for the straps. The Quanta reproduction has 4 crimps, 2 in the front seam flange and 2 in the back seam flange. Gary says that the old tanks I am looking at are both replacement tanks from the 70's and that the front seam flange being bent down it's entire length is incorrect. Hopefully, someone has a known original tank that can clear this up.
Neal

[Joe L.]

Re: '67 gas tank

John,
Can you be a little more specific with your reply?
Gary at Quanta insists that the front seam flange(the seam flange on the gas tank that faces the front of the car) was only crimped in 2 places to accomodate the straps. I am looking at 2 old tanks both from 67's(mine is probably a replacement, the other tank has St. Louis, the part number and U.S. Steel stenciled on it and the owner says it's original. Both my tank and his look the same and have blow out valves?) on which the front seam flange of tank is bent down the entire length of the seam flange and the back seam flange has 2 crimps for the straps. The Quanta reproduction has 4 crimps, 2 in the front seam flange and 2 in the back seam flange. Gary says that the old tanks I am looking at are both replacement tanks from the 70's and that the front seam flange being bent down it's entire length is incorrect. Hopefully, someone has a known original tank that can clear this up.
Neal

Neal------


Please describe more completely or, better yet, provide a picture of what you describe as a "blowout valve". As I mentioned previously, if you are referring to a round device about the size of a half dollar and located in the groove just to the left of the filler opening, that is an integral pressure vacuum valve. These valves were added to PRODUCTION Corvette fuel tanks in late 1969. They are also found on SERVICE fuel tanks for 1963-74 Corvettes sold by GM for about the last 35+ years.

NO 1963-E69 Corvette original fuel tank EVER had one of these valves installed. Period. If you find a fuel tank in a 1963-E69 Corvette which has such a device in it, then that fuel tank is a SERVICE fuel tank. If the tank has stenciled "St. Louis" on it, then someone did that as part of some sort of "restoration effort".

Something else to look for: 1963-E69 fuel tanks have large, "roundish" depressions on both ends of the tank, top and bottom. L69-74 tanks have large "rectangularish" depressions on both ends of the tank, top and bottom. If a tank has the "rectangularish" depressions, then it was NEVER originally installed on a 1963-E69 Corvette. Period.

A rather crude drawing which I think adequately depicts the differences is attached below.