So, was there ever a smaller tank made? a 12 maybe? Every spec I found said the 67 barracuda had a 18 gallon tank. I get around 1/4 tank and refill and it always takes right around 8 1/2 gallons.

The tank was new when i bought the car a few weeks ago.

This leads me to assume that my gauge is wrong or some sort of other size tank was put in. If the gauge being wrong is the case, whats the easiest solution to fix it?

I suppose the best way to find out i suppose is to run it dry with a gas can in the trunk with enough to get to a station?

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1968 Plymouth Barracuda [Daily Driver]
1972 Dodge Dart Swinger [Lent out as Daily Driver to a friend]
2010 Challenger R/T 6 Speed

The 1967-1976 A-body gas tank is physically the same size regardless of year and model (method of mounting changed in 1968 and emission and vent chose changed each year and location)...the filler neck has a piece of metal that runs the length (or part of) the filler tube. On the 70's cars, the filler neck changed the capacity of fill up to 16 gallons, and only on the Feather Duster/Dart Lite it changed to 14 gallons....because of the angle of the neck bend and different versions (slab side valiant/dart necks won't fit in a duster without a reweld....), so I doubt someone got a Feather Duster neck and swapped it out.

Typically the problem is the resistance of the pickup in the tank that gives a false reading (new pick up needed), or the wire has been damaged, or the gauge is in need of reconditioning (after 40 years I don't think I'd be 100% factory new either...LOL). Other factors can come into play if it's not the gauge or sending unit (a main one asked is: is the sending unit ground clip still attached to the outlet tube of the sending unit and the metal fuel line heading to the engine?-you'll have to jack up the car and look at the rear center of the gas tank).

My duster has tight seals since I rebuilt it and on an empty tank (about 2-3 gallons left), a gas station can put it on slow fill and it will click off after about 6-8 gallons...(fast fill will not work...and we now have a law against topping up here...so I fill a 5 gallon gas can and fill it up elsewhere)....so if everything is in good repair you may need to pull the nozzle a little and slow fill it a bit and hope you don't get a shower of gas from the tank....

The 2 gallon gas can in the trunk used to be my Aunt's saving grace in her 1974 Valiant when it was new....

-D.Idiot

16-18 gals is all I have ever seen. I have run my Darts (18 gals) to < 1 gal left, based on the refill of over 17 gals. Sounds like gas gauge.

I would do as you say and carry 2 gals of gas and run it out, then you can "calibrate" your gauge, at least in your head. I've had some gauges read pretty funky and I just recalibrate in my head.

My brother's old 68 Dart gauge would go down to 3/8th tank reading and just stop, so anything below that and you had no idea how much you had. We ran out of gas a few times trying to push the limit and telling ourselves we had plenty left...

Lou

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Home of Slant6-powered fun machines since 1988

It's for sure full, due to the angle on the filler kneck if i let it go till it kicks off it spills out all over the place, embarrassed the hell out of me on my first fill up.

Thanks for the tips I'll have to go down the list.
My odometer works and is spot on so till I have a better place to do work I may just figure out how many miles to empty and then estimate somewhere near there for fill ups. I am getting great gas millage (23 last fill up with mixed freeway and cruising on Mulholland and PCH) so if i can just get some more miles between fill ups that would be nice.

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1968 Plymouth Barracuda [Daily Driver]
1972 Dodge Dart Swinger [Lent out as Daily Driver to a friend]
2010 Challenger R/T 6 Speed

Due to the filler neck angle, the nozzle will click off WAY before it's full.

Do you fill until you can see the gas just about ready to come out the tube?

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Aftermarket sending units do this. I didn't find a good solution.

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Joshua

Mine takes 5 gallons at 1/4 full on the gauge, and 10 gallons on empty. I always just fill it when I hit 200 miles. And, I have to go slow. It will click shut off way before it is full.

Sam

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wonder if there is some kind of mod available. this is a problem for many older vehicles...