I posted this a while back...here it is again. My car has a repro gas tank with the AOL logo installed by previous owner. The filler neck will not center in the body opening. The car has never been damaged or repaired (I checked the dimensions) With the tank resting as it should on the rear frame rail and support brace, the filler neck is about an inch too far forward. I removed the repro straps and installed a used pair of original straps in an effort to solve the problem, with no success. I check another '66 roadster with its' original fuel tank never removed and it rests exactly as mine in relation to the rear frame rail and support brace. I also checked the distance from the fuel sending unit opening, to the rear frame, which matches mine Although I can't imagine why, I'm beginning to come to the conclusion that it must be the tank. I'm pretty much out of things to try, other than to find and install a used, original tank hoping that solves the problem.
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Re: '66 roadster gas tank filler neck position
Rob -
Did you bend the seam-weld flange down on the new tank at all four locations where the straps pass by the flange? The original tanks had the flanges pre-bent from Anderson, but the reproduction tanks don't. -
I meant to say about 1/4"-3/8" too far forward *NM*
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Re: '66 roadster gas tank filler neck position
John...
They appear to have been pre-bent already, which the tanks from Quanta are. I assume this is one of their tanks. It has a "made in canada" sticker on it. With the tank sitting properly on the brace and frame rail, and before the straps are installed, the neck is about 1/4"-3/8" forward from being centered and it bugs me every time I put gas in.Comment
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the rear frame will "roll foward" after so many
years as the engine cross member will roll towards the center of the carComment
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Re: the rear frame will "roll foward" after so man
Phil...
That's a thought...but the front of the tank is positioned as it should be on the removeable support. I confirmed this looking at a couple of cars that have not had their original tank removed or replaced.Comment
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Re: the rear frame will "roll foward" after so man
Have you measured the dimensions of the filler opening on the repop tank against an original to see if the tank opening location is correct?Comment
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Re: the rear frame will "roll foward" after so man
Steve...
No I haven't, but would like to compare them.Comment
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Re: '66 roadster gas tank filler neck position
You can try to add more felt padding under the front of the tank to make the neck go back a little. I assume there is some tolerance build up with the body to frame mounting and that +/- 1/4" may be typical of originals??My Project Pictures
http://temp.corvetteforum.net/classics/l78vetteman/Comment
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Re: '66 roadster gas tank filler neck position
Rob, we bought four of these new AOL tanks for midyears and the filler hole is in the wrong place on all of them. Compared to the old tanks we measured the new tanks hole was forward by 1/2 inch. We measured from the center rear of the tank flange to the hole opening. To install one of the tanks in a coupe we had to raise the front of the tank almost an inch. That centered the tank in the body opening but now it looks pretty bad. The convertibles cannot be raised that much because of the short filler neck. Quanah will not respond to our inquiries so it looks like we are stuck with bad repos and a large invoice to go along with the bad product. Now we tell everyone to measure their old tank and make the vendor on the new tank measure the one they are sending to make sure the hole is in the correct place. Havent found one yet that is correct to orginal. ScottComment
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Rob / Scott -- here's original showing dimension
from my '65 (just happened to have it on the bench). Straight edge resting vertically on mid-tank seam and held flush against the upper flat.
There's a repop tank on eBay with a couple of hours to go. Says it's made in North America, which is weasel-wording for either Mexico or Canada, eh ?.
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Re: '66 roadster gas tank filler neck position
Scott------
I believe that all of the tanks available on the market today, whether Quanta-supplied or others, are manufactured by Superior Industries. Superior is a Canadian-based automotive parts manufacturing operation. I think that when they manufacture a batch of tanks to Quanta's order, they utilize the O. L. Anderson logo which Quanta has obtained the license for.
However, I would expect that the location of the filler neck would be pretty much "standard" on the tanks that Superior manufactures and sells through whatever channels and regardless of how branded. So, what I'm saying is that I would expect to find the problem described on just about any tank available today and something that is out of the control of Quanta.
An interesting thought is this: the original 63-67 fuel tanks were of GM #3819506. This same tank was used throughout the period (except for 36-1/2 gallon installations, of course). For 1968, the tank changed to GM #3923687 for cars with vapor return provisions and GM #3931820 for cars without vapor return provisions (like all 63-67). In November, 1968, the 63-67 tank, GM #3819506, was discontinued and replaced, for SERVICE, by the 68-69 non-vapor return tank, GM #3931820. Then, in November, 1970 the 3931820 was discontinued and replaced, for SERVICE, by the GM #3967746. The latter tank incorporates an integral pressure-vacuum valve which the earlier tanks did not have.
PERHAPS, one of the differences between the 3819506 and the GM #3931820/3967746 is the location of the fuel filler opening. PERHAPS, GM once considered that the filler opening in the latter tanks was "close enough" to the location used for the 3819506 that they could just eliminate that tank and replace it by the 68+ tanks. If so, the "aftermarket replacement world" may just have followed suit.
I've always ASSUMED that the filler neck location of the 63-67 tank was the same as the 68-74. Maybe not!In Appreciation of John HinckleyComment
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Re: '66 roadster gas tank filler neck position
Scott....
I appreciate the info...atleast now I know what the problem is. I won't waste any more time and effort trying to make this one line up right. I'll keep my eye out for a decent used, original.Comment
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Re: Rob / Scott -- here's original showing dimensi
Wayne...
Looking at the picture, it seems to be about 1 1/8" from the stick to the front of the opening...is that correct?Comment
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1_3/16" to the edge of the filler opening
and the straight edge ruler represents the flat upper half of the tank, projected vertically.Comment
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