E-Body Fuel Tank

[cv70chall]

I recently replaced my aging tank with a new one and would like to know the capacity?

15gal?
19gal?

Thanks

[dakota]

From what I can tell, stock tanks have an 18 gallon capacity.

[Chryco Psycho]

18 US / 16 Can / Imperial

[duodec]

Does anyone make a true repro that includes the internal expansion tank like the originals?  ('71 Challenger here)

[anlauto]

Does anyone make a true repro that includes the internal expansion tank like the originals?  ('71 Challenger here)

Please explain

[duodec]

Please explain

The original tank in my '71 has a small internal 'tank' attached to the inside top.  You can see it through the sender and filler holes.  The service manual describes it as

"a 1.4 gallon over-fill limiter tank inside the main fuel tank".  It has an orifice that will allow fuel to enter it (slowly) from the main tank if the main is overfilled; that lowers the level in the main tank which then allows room for thermal expansion in the main tank.  There is also a little rubber plug in the center top of the main tank that I think opens into the expansion tank. 

I haven't looked for a new tank in several years (I still have the original but it was damaged by the company that was supposed to clean and check it; bastards punched a hole in it) but when I did none of the vendors would say that what they had included that internal tank (and the pics didn't show the rubber plug in the tank top).

[4Cruizn]

I have not heard that before?  Interesting . . . 

[anlauto]

A first for me too

[duodec]

Wow... thats surprising.  I assume every factory tank had that rubber plug in the top so if it really isn't present on replacement tanks  (which I have only seen pictures of or had described to me) it would be a clear difference...

The info came from the Dodge 1971 service manual, in the fuel tank section, and as I said, I can see the small tank (flat rectangular) in the center top of the main tank through the sender and filler holes.

[WildJones]

The original tank in my '71 has a small internal 'tank' attached to the inside top.  You can see it through the sender and filler holes.  The service manual describes it as

"a 1.4 gallon over-fill limiter tank inside the main fuel tank".  It has an orifice that will allow fuel to enter it (slowly) from the main tank if the main is overfilled; that lowers the level in the main tank which then allows room for thermal expansion in the main tank.  There is also a little rubber plug in the center top of the main tank that I think opens into the expansion tank. 

I haven't looked for a new tank in several years (I still have the original but it was damaged by the company that was supposed to clean and check it; bastards punched a hole in it) but when I did none of the vendors would say that what they had included that internal tank (and the pics didn't show the rubber plug in the tank top).

I was reading about ECS for my 70 Cuda to figure out what that tube in the trunk was for and came across an article on AllPar that covers all things fuel tank related. Duodec is right, this sort of tank was equipped on 70-71 e bodies.

The 1970-71 ECS used a complicated fuel tank, which had a small inner tank at the top connected to the main tank chamber by a very small passageway to prevent overfilling. When gasoline was pumped in, the main tank chamber filled up; the secondary chamber was still mostly empty. After the driver hung up the nozzle and drove off, fuel flowed into the secondary tank from the main chamber, dropping the fuel level in the main chamber and preventing fuel being forced out of the tank when things warmed up and expanded. (This also helped to prevent fuel stains from fuel sloshing out of the tank.)

More about the evaporation control systems and the rest of the article can be read here: http://www.allpar.com/fix/fuel/evaporation-control.html

I can't remember if the article covered this, but maybe this was offered most often for CA cars? Mine was built in LA and had all that stuff included on the car.

[bc3j]

Mine has it also. I believe it is N95 on the fender tag.

[duodec]

Going back to the service manual, I don't think the expansion tank was part of N95.  The sections that mention the expansion tank state "All Chrysler Corporation Vehicles", and list it as part of the Vapor Saver (ECS) system.

The NOx system for californicated cars is in addition to the ECS (vapor saver) that included the expansion tank, assuming I'm reading the service manual correctly, and assuming the info in it is correct.  But my car is an N95 so I have the speed sensor and temp sensor (and the car had the vacuum retard solenoid but that was missing when I bought the car in 1980).

[bc3j]

Question...Should the N95 cars have a pressure vacuum gas cap?

[Alum6Pac]

Built a Convertible using T/A exhaust and had a custom tank built  http://www.cuda-challenger.com/cc/Smileys/default/stirpot.gif  that came down to the bottom of the rear valence (without cutouts for exhaust) and filled the space between the frame rails. Nearly 40 gallons! FI pump was inside and used a different type of fuel sensor for telling remaining fuel. It was glorious! Used it for long distance cruising (from Seattle to Billings, Montana in 12 hours.

[duodec]

I'd wonder about the effect of that much weight (when full) that far back influencing the balance of the car.