Fuel tank replacement with EEC

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Reed1970

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Hey guys. I've got a question about a 1970 dart I am currently restoring. I need to replace the fuel tank, and the car has EEC system with the 4 vent lines and the filter in the trunk. Well, I have a replacement tank from classic industries without EEC for a 1970 and the opening for the filler tube is off about 1.5 inches towards the front of the car. See pictures. It seems the only aftermarket tank will work is one with ECC system and it moves the opening towards the back where the original tank opening was. So, my question is can I simply plug all 4 vents and run a vented filler tube (which I have from a 69 and it seems to fit), or will that cause any pressure or vacuum issues?

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Yes you can without issue, but the four vent could dump just like earlier systems.
 
MV8 said:
Yes you can without issue, but the four vent could dump just like earlier systems.
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Thank you for the response. After some more research it looks i may go with a single vent EEC tank from a 72. The filler tube opening looks to be in the correct location for my 70. My replace shown above is too far to the front of the car and i would have to cut the opening in the trunk and flex the filler tube over which i do not want to do and thats the main issue i have been having. So i was assuming because my car came with the 4 vents it was mandatory i needed to run the same tank because of the location of the opening for the filler tube.
 
The 4 vent canister does the same thing as the filler neck vent. The line out of the 4 vent canister that normally goes to the engine can dump the same as the one on the filler neck vent.

I wonder about the condition of the canister after all these years. I'd blow air through it to make sure the internals are not rusted to the point of being clogged. It is just four tubes of different lengths in a can and the longest tube is the vent. Functionally it is better but ugly imho.

If you want cleaner/no canister, a vent port could be added to the unvented neck that copies the factory vented neck. Many ways to do that but it must not leak fumes into the trunk or be damaged by stuff moving around in the trunk. Steel or nicopp(nickel/copper) AGS line (NOT the china copper crap on ebay being sold as brake and fuel line) attached with an inverted flare fitting to the neck or a couple inches of gates barrier efi hose would work well but it still needs support clamps to keep it from rubbing. Can be addel cushion clamps or no cushion if tight fitting (no sliding back and forth in the clamp).

Any tank without valves needs a vertical loop and vacuum break. The neck and the four vent cover that. A loop and a vertical mount, fat fuel filter near the top can do that.

There are all sorts of methods to make the whole system safer than original if you want to go for that.
 
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