[z man]

please tell me the gallon compacity in a 1968 GTO tank. and why are there offers of a 17 gallon or a 21 gallon tank for this car? will they both fit? has anyone upgraded to a larger tank that fit like an OEM? thanks, z man

[z man]

GTO dammit, 1968 GTO

[cuz68]

I think mine is a 21gal.

[Aus Goat]

I am 21 Gallons - 79.5 liters

[Greg Reid]

What vendor is offering a 17 gallon tank?
By the way, I got my '68 tank right at Advance Auto. Great quality Spectra brand tank and no shipping costs involved.

[R68GTO]

Originally Posted by Greg Reid

What vendor is offering a 17 gallon tank?
By the way, I got my '68 tank right at Advance Auto. Great quality Spectra brand tank and no shipping costs involved.

with or without neck installed?

[Greg Reid]

Now that you mention it, I intentionally got a '69 tank and 'adjusted' neck with a jack and a piece of wood. I got the tank and the new sending unit for under $200 with no shipping.

[z man]

So its safe to sat that it came with a 21 gallon tank out of the factory? The 17 gallon tanks are found on various e bay listings. how far was the neck off on the 69 tank? surprised their not identical. thanks, z man

[z man]

Greg, the advance auto tanks are identical in dimensions for the 68 and 69. the 69 is offered with the neck. this is the way I would go, same as you did. question, what is the neck difference? a slight angle, or more? As I want the flapper plate to close completely as OEM did at the neck on the 68. Other than the neck , were there any mods needed at the sending unit inlet? thanks, nick

[Greg Reid]

Yes, they are the same except for the '68 neck. It kicks up just a bit on the '68 to clear the bumper opening.
It's not a big difference. In fact, I thought mine was going to work until I actually put the bumper on. When I opened the tag mount, I couldn't get the gas cap off. I put a piece to 2x4 under the neck and applied pressure with a floor jack. It only took a little movement.
There's probably a better way to do it and maybe I got lucky but it worked fine.

[Ben M.]

Originally Posted by Greg Reid

It's not a big difference. In fact, I thought mine was going to work until I actually put the bumper on. When I opened the tag mount, I couldn't get the gas cap off. I put a piece to 2x4 under the neck and applied pressure with a floor jack.

Every new tank I've put in one of these '69-72 cars has the exact same issue. Put a little pressure on it up carefully and it will bend enough to clear.

[z man]

Thanks guys. the Spectra GM34D is the tank I want, for the 69 GTO. The sending unit is the same for both 68 and69 Spectra FG91B. the price on the units vary by $20 plus ,even with website discounts. I have been relying on a tank mounted electric pump for years, to back up my mechanical pump at wide open throttle. without it, the engine bogs and starves. I have not dropped the tank, but can see its beat. the lines also need a full inspection, 3/8 original. Want to fully enjoy my “cliff” carb coming my way. Pray for SUN. z man

[gtohurstjudge]

get the stainless steel tank offered by Auto City Classic. It stays looking beautiful forever, plus you don't have to worry about corrosion from alcohol laced fuel. they also
sell a stainless steel sending unit. when I bought my stainless tank for my GTO it was actually cheaper than the identical tin plated steel tank.

[68pongto]

We have put a few of the 69 tanks in 68's at our shop. You just have to tweak the neck a little.

[68ragtop]

Is the neck on the spectra's soldered in? Thinking of ordering the 69 style for my 68, but would like the option of installing the original 68 neck if I like that better.

EDIT: also, are these made from galvanized or some other protective treated metal?

[68ragtop]

One more question. Are these fairly protected in the box when shipped? I am guessing with the size they are, there a good chance they could get dinged up?

I'm probably going to order one from advance auto so I have some recourse if it arrives damaged.

[z man]

it was shipped through auto zone . found 2 areas dented, but not affecting tank integrity,so kept and installed. very important not to flex neck at tank. it is soldered, but any flexing at the joint will cause a crack/ leak. how do i know? i had to buy the tank sealer epoxy to spread over a minute crack that kept seeping. all is well now and should last another 15-20 years. support the neck and flex only the neck. very slight adjustment required. z-man

[68ragtop]

Glad to hear its a soldered neck. I could always install the original neck from my 68 tank if needed. My 68 has been going through a nut & bolt restoration for seemingly forever. I am getting closer to finished, but given the level to which I am restoring the car, I am nervous about dents in the tank. Given the purpose of the tank, I am guessing they are not shipped with the greatest of care. Also, The 69 tank for some reason is less money than the 68, so I am going to go that route.

Whats up with the venting. I thought there was only the neck vent. why did the 68 have more than one? anybody know?

[z man]

the neck vent is about a 1/4 inch at best. the vent forward of the LH side is 1/2 inch and seems to do the majority of the venting as your pulling fuel through a 3/8 line with a non vented cap. z man

[68ragtop]

So are the guys that run a 69 tank in a 68 just using a 69 cap then?
I have the tank on its way here. I hope it doesn't get damaged. I am picturing a non padded box that UPS will have their way with...... Seems like anytime something comes oversized or heavy it get hammered. makes me more than nervous.